23820138 has 24 divisors (see below), whose sum is σ = 52193700. Its totient is φ = 7850304.

The previous prime is 23820133. The next prime is 23820149. The reversal of 23820138 is 83102832.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 2169729 = 4653^2 + 1473^2 .

It is not an unprimeable number, because it can be changed into a prime (23820131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5833 + ... + 9036.

Almost surely, 2^23820138 is an apocalyptic number.

23820138 is an abundant number, since it is smaller than the sum of its proper divisors (28373562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23820138 is a wasteful number, since it uses less digits than its factorization.

23820138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14966 (or 14963 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 23820138 is about 4880.5878744266. The cubic root of 23820138 is about 287.7275345578.

The spelling of 23820138 in words is "twenty-three million, eight hundred twenty thousand, one hundred thirty-eight".