20397013 has 32 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 14904000.

The previous prime is 20396993. The next prime is 20397019. The reversal of 20397013 is 31079302.

It is a cyclic number.

It is not a de Polignac number, because 20397013 - 2¹³ = 20388821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20397019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81138 + ... + 81388.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^20397013 is an apocalyptic number.

It is an amenable number.

20397013 is a deficient number, since it is larger than the sum of its proper divisors (6698027).

20397013 is a wasteful number, since it uses less digits than its factorization.

20397013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

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

The square root of 20397013 is about 4516.3052376915. The cubic root of 20397013 is about 273.2261049093.

The spelling of 20397013 in words is "twenty million, three hundred ninety-seven thousand, thirteen".