20870912 has 18 divisors (see below), whose sum is σ = 41660808. Its totient is φ = 10435328.

The previous prime is 20870909. The next prime is 20870939. The reversal of 20870912 is 21907802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40508 + ... + 41019.

Almost surely, 2^20870912 is an apocalyptic number.

It is an amenable number.

20870912 is a deficient number, since it is larger than the sum of its proper divisors (20789896).

20870912 is an frugal number, since it uses more digits than its factorization.

20870912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81543 (or 81529 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20870912 is about 4568.4693279040. The cubic root of 20870912 is about 275.3259473982.

The spelling of 20870912 in words is "twenty million, eight hundred seventy thousand, nine hundred twelve".