20864156 has 6 divisors (see below), whose sum is σ = 36512280. Its totient is φ = 10432076.

The previous prime is 20864153. The next prime is 20864161. The reversal of 20864156 is 65146802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2608016 + ... + 2608023.

It is an arithmetic number, because the mean of its divisors is an integer number (6085380).

Almost surely, 2^20864156 is an apocalyptic number.

It is an amenable number.

20864156 is a deficient number, since it is larger than the sum of its proper divisors (15648124).

20864156 is a wasteful number, since it uses less digits than its factorization.

20864156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216043 (or 5216041 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20864156 is about 4567.7298519067. The cubic root of 20864156 is about 275.2962361451.

The spelling of 20864156 in words is "twenty million, eight hundred sixty-four thousand, one hundred fifty-six".