20002456520 has 64 divisors (see below), whose sum is σ = 47436030000. Its totient is φ = 7579307008.

The previous prime is 20002456519. The next prime is 20002456531. The reversal of 20002456520 is 2565420002.

It can be written as a sum of positive squares in 8 ways, for example, as 7704977284 + 12297479236 = 87778^2 + 110894^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20002456520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101195 + ... + 224154.

Almost surely, 2^20002456520 is an apocalyptic number.

20002456520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002456520 is an abundant number, since it is smaller than the sum of its proper divisors (27433573480).

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

20002456520 is a wasteful number, since it uses less digits than its factorization.

20002456520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325442 (or 325438 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20002456520 its reverse (2565420002), we get a palindrome (22567876522).

The spelling of 20002456520 in words is "twenty billion, two million, four hundred fifty-six thousand, five hundred twenty".