20512816 has 10 divisors (see below), whose sum is σ = 39743612. Its totient is φ = 10256400.

The previous prime is 20512771. The next prime is 20512841. The reversal of 20512816 is 61821502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641010 + ... + 641041.

Almost surely, 2^20512816 is an apocalyptic number.

It is an amenable number.

20512816 is a deficient number, since it is larger than the sum of its proper divisors (19230796).

20512816 is a wasteful number, since it uses less digits than its factorization.

20512816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282059 (or 1282053 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20512816 is about 4529.1076383765. The cubic root of 20512816 is about 273.7422051811.

The spelling of 20512816 in words is "twenty million, five hundred twelve thousand, eight hundred sixteen".