20663262464 has 36 divisors (see below), whose sum is σ = 44418570756. Its totient is φ = 9536888832.

The previous prime is 20663262437. The next prime is 20663262547. The reversal of 20663262464 is 46426236602.

It can be written as a sum of positive squares in 2 ways, for example, as 13234201600 + 7429060864 = 115040^2 + 86192^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3101129 + ... + 3107784.

Almost surely, 2^20663262464 is an apocalyptic number.

It is an amenable number.

20663262464 is an abundant number, since it is smaller than the sum of its proper divisors (23755308292).

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

20663262464 is an equidigital number, since it uses as much as digits as its factorization.

20663262464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6208942 (or 6208928 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 20663262464 in words is "twenty billion, six hundred sixty-three million, two hundred sixty-two thousand, four hundred sixty-four".