20406664464 has 60 divisors (see below), whose sum is σ = 54180688464. Its totient is φ = 6618356352.

The previous prime is 20406664451. The next prime is 20406664489. The reversal of 20406664464 is 46446660402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89562 + ... + 220985.

Almost surely, 2^20406664464 is an apocalyptic number.

20406664464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20406664464 is an abundant number, since it is smaller than the sum of its proper divisors (33774024000).

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

20406664464 is a wasteful number, since it uses less digits than its factorization.

20406664464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310632 (or 310589 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 20406664464 in words is "twenty billion, four hundred six million, six hundred sixty-four thousand, four hundred sixty-four".