20664464260 has 24 divisors (see below), whose sum is σ = 47340409536. Its totient is φ = 7514350560.

The previous prime is 20664464237. The next prime is 20664464273. The reversal of 20664464260 is 6246446602.

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, 46964472 + ... + 46964911.

It is an arithmetic number, because the mean of its divisors is an integer number (1972517064).

Almost surely, 2^20664464260 is an apocalyptic number.

20664464260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664464260 is an abundant number, since it is smaller than the sum of its proper divisors (26675945276).

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

20664464260 is a wasteful number, since it uses less digits than its factorization.

20664464260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93929403 (or 93929401 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 20664464260 in words is "twenty billion, six hundred sixty-four million, four hundred sixty-four thousand, two hundred sixty".