20456203664 has 40 divisors (see below), whose sum is σ = 43267381752. Its totient is φ = 9311984640.

The previous prime is 20456203613. The next prime is 20456203667. The reversal of 20456203664 is 46630265402.

It can be written as a sum of positive squares in 4 ways, for example, as 90630400 + 20365573264 = 9520^2 + 142708^2 .

It is not an unprimeable number, because it can be changed into a prime (20456203667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658427 + ... + 688794.

Almost surely, 2^20456203664 is an apocalyptic number.

It is an amenable number.

20456203664 is an abundant number, since it is smaller than the sum of its proper divisors (22811178088).

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

20456203664 is a wasteful number, since it uses less digits than its factorization.

20456203664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347315 (or 1347309 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 20456203664 in words is "twenty billion, four hundred fifty-six million, two hundred three thousand, six hundred sixty-four".