20896813 has 4 divisors (see below), whose sum is σ = 23882080. Its totient is φ = 17911548.

The previous prime is 20896801. The next prime is 20896817. The reversal of 20896813 is 31869802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20896813 - 2⁵ = 20896781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20896817) 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, 1492623 + ... + 1492636.

It is an arithmetic number, because the mean of its divisors is an integer number (5970520).

Almost surely, 2^20896813 is an apocalyptic number.

It is an amenable number.

20896813 is a deficient number, since it is larger than the sum of its proper divisors (2985267).

20896813 is an equidigital number, since it uses as much as digits as its factorization.

20896813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985266.

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

The square root of 20896813 is about 4571.3032058703. The cubic root of 20896813 is about 275.4397943546.

It can be divided in two parts, 208968 and 13, that added together give a triangular number (208981 = T₆₄₆).

The spelling of 20896813 in words is "twenty million, eight hundred ninety-six thousand, eight hundred thirteen".