20856396 has 24 divisors (see below), whose sum is σ = 53089344. Its totient is φ = 6320080.

The previous prime is 20856389. The next prime is 20856439. The reversal of 20856396 is 69365802.

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, 78870 + ... + 79133.

It is an arithmetic number, because the mean of its divisors is an integer number (2212056).

Almost surely, 2^20856396 is an apocalyptic number.

It is an amenable number.

20856396 is an abundant number, since it is smaller than the sum of its proper divisors (32232948).

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

20856396 is a wasteful number, since it uses less digits than its factorization.

20856396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158021 (or 158019 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20856396 is about 4566.8803356339. The cubic root of 20856396 is about 275.2621016276.

The spelling of 20856396 in words is "twenty million, eight hundred fifty-six thousand, three hundred ninety-six".