20900613 has 16 divisors (see below), whose sum is σ = 28525952. Its totient is φ = 13608000.

The previous prime is 20900609. The next prime is 20900653. The reversal of 20900613 is 31600902.

It is not a de Polignac number, because 20900613 - 2² = 20900609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20900613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20900653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32808 + ... + 33438.

It is an arithmetic number, because the mean of its divisors is an integer number (1782872).

Almost surely, 2^20900613 is an apocalyptic number.

It is an amenable number.

20900613 is a deficient number, since it is larger than the sum of its proper divisors (7625339).

20900613 is a wasteful number, since it uses less digits than its factorization.

20900613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20900613 is about 4571.7188233749. The cubic root of 20900613 is about 275.4564892095.

The spelling of 20900613 in words is "twenty million, nine hundred thousand, six hundred thirteen".