20937013 has 4 divisors (see below), whose sum is σ = 22168620. Its totient is φ = 19705408.

The previous prime is 20936947. The next prime is 20937017. The reversal of 20937013 is 31073902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15186609 + 5750404 = 3897^2 + 2398^2 .

It is a cyclic number.

It is not a de Polignac number, because 20937013 - 2¹³ = 20928821 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 (20937017) 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, 615778 + ... + 615811.

It is an arithmetic number, because the mean of its divisors is an integer number (5542155).

Almost surely, 2^20937013 is an apocalyptic number.

It is an amenable number.

20937013 is a deficient number, since it is larger than the sum of its proper divisors (1231607).

20937013 is a wasteful number, since it uses less digits than its factorization.

20937013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231606.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20937013 is about 4575.6980888166. The cubic root of 20937013 is about 275.6163059116.

The spelling of 20937013 in words is "twenty million, nine hundred thirty-seven thousand, thirteen".