20672816 has 20 divisors (see below), whose sum is σ = 42410232. Its totient is φ = 9728256.

The previous prime is 20672807. The next prime is 20672843. The reversal of 20672816 is 61827602.

It is a Smith number, since the sum of its digits (32) 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 3 ways as a sum of consecutive naturals, for example, 37730 + ... + 38273.

Almost surely, 2^20672816 is an apocalyptic number.

It is an amenable number.

20672816 is an abundant number, since it is smaller than the sum of its proper divisors (21737416).

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

20672816 is a wasteful number, since it uses less digits than its factorization.

20672816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76028 (or 76022 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20672816 is about 4546.7368518532. The cubic root of 20672816 is about 274.4520925503.

The spelling of 20672816 in words is "twenty million, six hundred seventy-two thousand, eight hundred sixteen".