20847639396 has 24 divisors (see below), whose sum is σ = 48661681824. Its totient is φ = 6946757440.

The previous prime is 20847639353. The next prime is 20847639413. The reversal of 20847639396 is 69393674802.

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, 271425 + ... + 339656.

It is an arithmetic number, because the mean of its divisors is an integer number (2027570076).

Almost surely, 2^20847639396 is an apocalyptic number.

It is an amenable number.

20847639396 is an abundant number, since it is smaller than the sum of its proper divisors (27814042428).

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

20847639396 is a wasteful number, since it uses less digits than its factorization.

20847639396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613931 (or 613929 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 20847639396 in words is "twenty billion, eight hundred forty-seven million, six hundred thirty-nine thousand, three hundred ninety-six".