20423907 has 24 divisors (see below), whose sum is σ = 34967296. Its totient is φ = 11669832.

The previous prime is 20423903. The next prime is 20423911. The reversal of 20423907 is 70932402.

It is an interprime number because it is at equal distance from previous prime (20423903) and next prime (20423911).

It is not a de Polignac number, because 20423907 - 2² = 20423903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4303 + ... + 7704.

Almost surely, 2^20423907 is an apocalyptic number.

20423907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20423907 is a deficient number, since it is larger than the sum of its proper divisors (14543389).

20423907 is an equidigital number, since it uses as much as digits as its factorization.

20423907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12029 (or 12017 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20423907 is about 4519.2816907115. The cubic root of 20423907 is about 273.3461374463.

The spelling of 20423907 in words is "twenty million, four hundred twenty-three thousand, nine hundred seven".