20993812 has 12 divisors (see below), whose sum is σ = 41987680. Its totient is φ = 8997336.

The previous prime is 20993801. The next prime is 20993813. The reversal of 20993812 is 21839902.

20993812 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374862 + ... + 374917.

Almost surely, 2^20993812 is an apocalyptic number.

It is an amenable number.

20993812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20993812 is a wasteful number, since it uses less digits than its factorization.

20993812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749790 (or 749788 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20993812 is about 4581.9004790589. The cubic root of 20993812 is about 275.8653162096.

The spelling of 20993812 in words is "twenty million, nine hundred ninety-three thousand, eight hundred twelve".