20609862564 has 48 divisors (see below), whose sum is σ = 50022947520. Its totient is φ = 6596392320.

The previous prime is 20609862557. The next prime is 20609862589. The reversal of 20609862564 is 46526890602.

It is a happy number.

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, 100614 + ... + 226589.

It is an arithmetic number, because the mean of its divisors is an integer number (1042144740).

Almost surely, 2^20609862564 is an apocalyptic number.

It is an amenable number.

20609862564 is an abundant number, since it is smaller than the sum of its proper divisors (29413084956).

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

20609862564 is a wasteful number, since it uses less digits than its factorization.

20609862564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327420 (or 327418 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 20609862564 in words is "twenty billion, six hundred nine million, eight hundred sixty-two thousand, five hundred sixty-four".