20351632506564 has 12 divisors (see below), whose sum is σ = 47487142515344. Its totient is φ = 6783877502184.

The previous prime is 20351632506539. The next prime is 20351632506599. The reversal of 20351632506564 is 46560523615302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 847984687762 + ... + 847984687785.

Almost surely, 2^{20351632506564} is an apocalyptic number.

It is an amenable number.

20351632506564 is an abundant number, since it is smaller than the sum of its proper divisors (27135510008780).

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

20351632506564 is a wasteful number, since it uses less digits than its factorization.

20351632506564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695969375554 (or 1695969375552 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 20351632506564 in words is "twenty trillion, three hundred fifty-one billion, six hundred thirty-two million, five hundred six thousand, five hundred sixty-four".