20423913 has 4 divisors (see below), whose sum is σ = 27231888. Its totient is φ = 13615940.

The previous prime is 20423911. The next prime is 20423927. The reversal of 20423913 is 31932402.

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 20423913 - 2¹ = 20423911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20423911) 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, 3403983 + ... + 3403988.

It is an arithmetic number, because the mean of its divisors is an integer number (6807972).

Almost surely, 2^20423913 is an apocalyptic number.

It is an amenable number.

20423913 is a deficient number, since it is larger than the sum of its proper divisors (6807975).

20423913 is an equidigital number, since it uses as much as digits as its factorization.

20423913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807974.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20423913 is about 4519.2823545337. The cubic root of 20423913 is about 273.3461642136.

The spelling of 20423913 in words is "twenty million, four hundred twenty-three thousand, nine hundred thirteen".