20986912 has 24 divisors (see below), whose sum is σ = 41787900. Its totient is φ = 10374144.

The previous prime is 20986897. The next prime is 20986913. The reversal of 20986912 is 21968902.

It can be written as a sum of positive squares in 2 ways, for example, as 20830096 + 156816 = 4564^2 + 396^2 .

It is not an unprimeable number, because it can be changed into a prime (20986913) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 837 + ... + 6532.

Almost surely, 2^20986912 is an apocalyptic number.

It is an amenable number.

20986912 is a deficient number, since it is larger than the sum of its proper divisors (20800988).

20986912 is an equidigital number, since it uses as much as digits as its factorization.

20986912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7468 (or 7460 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 20986912 is about 4581.1474545140. The cubic root of 20986912 is about 275.8350901720.

The spelling of 20986912 in words is "twenty million, nine hundred eighty-six thousand, nine hundred twelve".