20813896 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 9292800.

The previous prime is 20813887. The next prime is 20813921. The reversal of 20813896 is 69831802.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233820 + ... + 233908.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^20813896 is an apocalyptic number.

It is an amenable number.

20813896 is an abundant number, since it is smaller than the sum of its proper divisors (22731704).

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

20813896 is a wasteful number, since it uses less digits than its factorization.

20813896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20813896 is about 4562.2248958156. The cubic root of 20813896 is about 275.0750032333.

The spelling of 20813896 in words is "twenty million, eight hundred thirteen thousand, eight hundred ninety-six".