20912686 has 16 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 9729280.

The previous prime is 20912677. The next prime is 20912707. The reversal of 20912686 is 68621902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 430 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2099520).

Almost surely, 2^20912686 is an apocalyptic number.

20912686 is a deficient number, since it is larger than the sum of its proper divisors (12679634).

20912686 is a wasteful number, since it uses less digits than its factorization.

20912686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20912686 is about 4573.0390332907. The cubic root of 20912686 is about 275.5095170971.

The spelling of 20912686 in words is "twenty million, nine hundred twelve thousand, six hundred eighty-six".