20909604 has 12 divisors (see below), whose sum is σ = 48789104. Its totient is φ = 6969864.

The previous prime is 20909587. The next prime is 20909621. The reversal of 20909604 is 40690902.

It is an interprime number because it is at equal distance from previous prime (20909587) and next prime (20909621).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871222 + ... + 871245.

Almost surely, 2^20909604 is an apocalyptic number.

It is an amenable number.

20909604 is an abundant number, since it is smaller than the sum of its proper divisors (27879500).

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

20909604 is a wasteful number, since it uses less digits than its factorization.

20909604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742474 (or 1742472 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20909604 is about 4572.7020458368. The cubic root of 20909604 is about 275.4959820583.

The spelling of 20909604 in words is "twenty million, nine hundred nine thousand, six hundred four".