20836868 has 24 divisors (see below), whose sum is σ = 39919320. Its totient is φ = 9457920.

The previous prime is 20836847. The next prime is 20836889. The reversal of 20836868 is 86863802.

It is an interprime number because it is at equal distance from previous prime (20836847) and next prime (20836889).

It can be written as a sum of positive squares in 4 ways, for example, as 334084 + 20502784 = 578^2 + 4528^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 113 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (1663305).

Almost surely, 2^20836868 is an apocalyptic number.

It is an amenable number.

20836868 is a deficient number, since it is larger than the sum of its proper divisors (19082452).

20836868 is a wasteful number, since it uses less digits than its factorization.

20836868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647 (or 6645 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 20836868 is about 4564.7418327875. The cubic root of 20836868 is about 275.1761648108.

The spelling of 20836868 in words is "twenty million, eight hundred thirty-six thousand, eight hundred sixty-eight".