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20005020 = 22325715877
BaseRepresentation
bin100110001010…
…0000010011100
31101122100201200
41030110002130
520110130040
61552435500
7332016450
oct114240234
941570650
1020005020
1110324082
126848b90
1341b57b9
14292a660
151b52630
hex131409c

20005020 has 72 divisors (see below), whose sum is σ = 69355104. Its totient is φ = 4572288.

The previous prime is 20005003. The next prime is 20005021. The reversal of 20005020 is 2050002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 20004993 and 20005011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6679 + ... + 9198.

Almost surely, 220005020 is an apocalyptic number.

20005020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005020 is an abundant number, since it is smaller than the sum of its proper divisors (49350084).

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

20005020 is a wasteful number, since it uses less digits than its factorization.

20005020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15899 (or 15894 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 20005020 is about 4472.6971728477. The cubic root of 20005020 is about 271.4644703870.

Adding to 20005020 its reverse (2050002), we get a palindrome (22055022).

The spelling of 20005020 in words is "twenty million, five thousand, twenty".

Divisors: 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 60 63 70 84 90 105 126 140 180 210 252 315 420 630 1260 15877 31754 47631 63508 79385 95262 111139 142893 158770 190524 222278 238155 285786 317540 333417 444556 476310 555695 571572 666834 714465 952620 1000251 1111390 1333668 1428930 1667085 2000502 2222780 2857860 3334170 4001004 5001255 6668340 10002510 20005020