20813996 has 24 divisors (see below), whose sum is σ = 43065120. Its totient is φ = 8612352.

The previous prime is 20813983. The next prime is 20814023. The reversal of 20813996 is 69931802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12005 + ... + 13628.

It is an arithmetic number, because the mean of its divisors is an integer number (1794380).

Almost surely, 2^20813996 is an apocalyptic number.

It is an amenable number.

20813996 is an abundant number, since it is smaller than the sum of its proper divisors (22251124).

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

20813996 is a wasteful number, since it uses less digits than its factorization.

20813996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25673 (or 25671 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 20813996 is about 4562.2358553674. The cubic root of 20813996 is about 275.0754437636.

The spelling of 20813996 in words is "twenty million, eight hundred thirteen thousand, nine hundred ninety-six".