20445632164 has 12 divisors (see below), whose sum is σ = 35801967600. Its totient is φ = 10216498568.

The previous prime is 20445632159. The next prime is 20445632177. The reversal of 20445632164 is 46123654402.

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, 1572094 + ... + 1585045.

It is an arithmetic number, because the mean of its divisors is an integer number (2983497300).

Almost surely, 2^20445632164 is an apocalyptic number.

It is an amenable number.

20445632164 is a deficient number, since it is larger than the sum of its proper divisors (15356335436).

20445632164 is a wasteful number, since it uses less digits than its factorization.

20445632164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158762 (or 3158760 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 20445632164 in words is "twenty billion, four hundred forty-five million, six hundred thirty-two thousand, one hundred sixty-four".