20621564802 has 48 divisors (see below), whose sum is σ = 46989895680. Its totient is φ = 6523203456.

The previous prime is 20621564749. The next prime is 20621564807. The reversal of 20621564802 is 20846512602.

It is a happy number.

20621564802 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 1 + 5 + 648 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (20621564807) 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, 143527 + ... + 248682.

It is an arithmetic number, because the mean of its divisors is an integer number (978956160).

Almost surely, 2^20621564802 is an apocalyptic number.

20621564802 is an abundant number, since it is smaller than the sum of its proper divisors (26368330878).

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

20621564802 is a wasteful number, since it uses less digits than its factorization.

20621564802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392367 (or 392364 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 20621564802 in words is "twenty billion, six hundred twenty-one million, five hundred sixty-four thousand, eight hundred two".