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19220000 = 2554312
BaseRepresentation
bin100100101010…
…0011000100000
31100011110212212
41021110120200
514410020000
61523541252
7322236662
oct111243040
940143785
1019220000
11a9382a8
12652a828
133c9c3a7
1427a4532
151a49c35
hex1254620

19220000 has 90 divisors (see below), whose sum is σ = 48858579. Its totient is φ = 7440000.

The previous prime is 19219999. The next prime is 19220009. The reversal of 19220000 is 2291.

19220000 = 2162 + 2172 + ... + 4072.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 4443664 + 14776336 = 2108^2 + 3844^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=3100.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19220009) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 619985 + ... + 620015.

Almost surely, 219220000 is an apocalyptic number.

19220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19220000

19220000 is an abundant number, since it is smaller than the sum of its proper divisors (29638579).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19220000 is an frugal number, since it uses more digits than its factorization.

19220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 19220000 is about 4384.0620433566. The cubic root of 19220000 is about 267.8661245665.

Adding to 19220000 its reverse (2291), we get a palindrome (19222291).

The spelling of 19220000 in words is "nineteen million, two hundred twenty thousand".

Divisors: 1 2 4 5 8 10 16 20 25 31 32 40 50 62 80 100 124 125 155 160 200 248 250 310 400 496 500 620 625 775 800 961 992 1000 1240 1250 1550 1922 2000 2480 2500 3100 3844 3875 4000 4805 4960 5000 6200 7688 7750 9610 10000 12400 15376 15500 19220 19375 20000 24025 24800 30752 31000 38440 38750 48050 62000 76880 77500 96100 120125 124000 153760 155000 192200 240250 310000 384400 480500 600625 620000 768800 961000 1201250 1922000 2402500 3844000 4805000 9610000 19220000