20912812 has 12 divisors (see below), whose sum is σ = 36975400. Its totient is φ = 10348416.

The previous prime is 20912809. The next prime is 20912831. The reversal of 20912812 is 21821902.

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, 26562 + ... + 27337.

Almost surely, 2^20912812 is an apocalyptic number.

It is an amenable number.

20912812 is a deficient number, since it is larger than the sum of its proper divisors (16062588).

20912812 is a wasteful number, since it uses less digits than its factorization.

20912812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54000 (or 53998 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20912812 is about 4573.0528096666. The cubic root of 20912812 is about 275.5100704156.

The spelling of 20912812 in words is "twenty million, nine hundred twelve thousand, eight hundred twelve".