20405465972 has 24 divisors (see below), whose sum is σ = 36623368320. Its totient is φ = 9942229440.

The previous prime is 20405465911. The next prime is 20405465981. The reversal of 20405465972 is 27956450402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68453 + ... + 213299.

It is an arithmetic number, because the mean of its divisors is an integer number (1525973680).

Almost surely, 2^20405465972 is an apocalyptic number.

It is an amenable number.

20405465972 is a deficient number, since it is larger than the sum of its proper divisors (16217902348).

20405465972 is a wasteful number, since it uses less digits than its factorization.

20405465972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145751 (or 145749 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 20405465972 in words is "twenty billion, four hundred five million, four hundred sixty-five thousand, nine hundred seventy-two".