23438820 has 24 divisors (see below), whose sum is σ = 65628864. Its totient is φ = 6250336.

The previous prime is 23438819. The next prime is 23438843. The reversal of 23438820 is 2883432.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195264 + ... + 195383.

It is an arithmetic number, because the mean of its divisors is an integer number (2734536).

Almost surely, 2^23438820 is an apocalyptic number.

23438820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23438820 is an abundant number, since it is smaller than the sum of its proper divisors (42190044).

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

23438820 is a wasteful number, since it uses less digits than its factorization.

23438820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390659 (or 390657 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 23438820 is about 4841.3655098536. The cubic root of 23438820 is about 286.1839330630.

The spelling of 23438820 in words is "twenty-three million, four hundred thirty-eight thousand, eight hundred twenty".