Search a number
-
+
20550001 = 194325153
BaseRepresentation
bin100111001100…
…1000101110001
31102200001022011
41032121011301
520230100001
62012242521
7336446353
oct116310561
942601264
1020550001
111066657a
126a70441
134346884
142a2d0d3
151c0dd51
hex1399171

20550001 has 8 divisors (see below), whose sum is σ = 22135520. Its totient is φ = 19014912.

The previous prime is 20549999. The next prime is 20550007. The reversal of 20550001 is 10005502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20550001 - 21 = 20549999 is a prime.

It is a super-2 number, since 2×205500012 = 844605082200002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20550007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11760 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (2766940).

Almost surely, 220550001 is an apocalyptic number.

It is an amenable number.

20550001 is a deficient number, since it is larger than the sum of its proper divisors (1585519).

20550001 is a wasteful number, since it uses less digits than its factorization.

20550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25215.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 20550001 is about 4533.2108929544. The cubic root of 20550001 is about 273.9075158060.

Adding to 20550001 its reverse (10005502), we get a palindrome (30555503).

The spelling of 20550001 in words is "twenty million, five hundred fifty thousand, one".

Divisors: 1 19 43 817 25153 477907 1081579 20550001