20423807 has 4 divisors (see below), whose sum is σ = 20559216. Its totient is φ = 20288400.

The previous prime is 20423773. The next prime is 20423813. The reversal of 20423807 is 70832402.

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

It is a cyclic number.

It is not a de Polignac number, because 20423807 - 2⁸ = 20423551 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 (20423407) 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, 67478 + ... + 67779.

It is an arithmetic number, because the mean of its divisors is an integer number (5139804).

Almost surely, 2^20423807 is an apocalyptic number.

20423807 is a deficient number, since it is larger than the sum of its proper divisors (135409).

20423807 is a wasteful number, since it uses less digits than its factorization.

20423807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135408.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20423807 is about 4519.2706269928. The cubic root of 20423807 is about 273.3456913244.

The spelling of 20423807 in words is "twenty million, four hundred twenty-three thousand, eight hundred seven".