20663464236 has 24 divisors (see below), whose sum is σ = 48334997424. Its totient is φ = 6870643200.

The previous prime is 20663464127. The next prime is 20663464271. The reversal of 20663464236 is 63246436602.

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, 2142265 + ... + 2151888.

It is an arithmetic number, because the mean of its divisors is an integer number (2013958226).

Almost surely, 2^20663464236 is an apocalyptic number.

It is an amenable number.

20663464236 is an abundant number, since it is smaller than the sum of its proper divisors (27671533188).

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

20663464236 is a wasteful number, since it uses less digits than its factorization.

20663464236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294561 (or 4294559 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 42.

The spelling of 20663464236 in words is "twenty billion, six hundred sixty-three million, four hundred sixty-four thousand, two hundred thirty-six".