20245521664 has 36 divisors (see below), whose sum is σ = 41715587200. Its totient is φ = 9796216320.

The previous prime is 20245521643. The next prime is 20245521671. The reversal of 20245521664 is 46612554202.

It is a happy number.

It is a super-2 number, since 2×20245521664² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 1267614 + ... + 1283485.

Almost surely, 2^20245521664 is an apocalyptic number.

It is an amenable number.

20245521664 is an abundant number, since it is smaller than the sum of its proper divisors (21470065536).

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

20245521664 is an equidigital number, since it uses as much as digits as its factorization.

20245521664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551146 (or 2551132 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 20245521664 in words is "twenty billion, two hundred forty-five million, five hundred twenty-one thousand, six hundred sixty-four".