20679913 has 8 divisors (see below), whose sum is σ = 21124800. Its totient is φ = 20238288.

The previous prime is 20679877. The next prime is 20679959. The reversal of 20679913 is 31997602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20679913 - 2⁹ = 20679401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20679983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15220 + ... + 16522.

It is an arithmetic number, because the mean of its divisors is an integer number (2640600).

Almost surely, 2^20679913 is an apocalyptic number.

It is an amenable number.

20679913 is a deficient number, since it is larger than the sum of its proper divisors (444887).

20679913 is a wasteful number, since it uses less digits than its factorization.

20679913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20679913 is about 4547.5172347117. The cubic root of 20679913 is about 274.4834955234.

The spelling of 20679913 in words is "twenty million, six hundred seventy-nine thousand, nine hundred thirteen".