23156420 has 36 divisors (see below), whose sum is σ = 56570220. Its totient is φ = 7939008.

The previous prime is 23156417. The next prime is 23156449. The reversal of 23156420 is 2465132.

It can be written as a sum of positive squares in 2 ways, for example, as 3211264 + 19945156 = 1792^2 + 4466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10835 + ... + 12794.

It is an arithmetic number, because the mean of its divisors is an integer number (1571395).

Almost surely, 2^23156420 is an apocalyptic number.

23156420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23156420 is an abundant number, since it is smaller than the sum of its proper divisors (33413800).

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

23156420 is a wasteful number, since it uses less digits than its factorization.

23156420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23652 (or 23643 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 23156420 is about 4812.1118025250. Note that the first 3 decimals coincide. The cubic root of 23156420 is about 285.0299342725.

The spelling of 23156420 in words is "twenty-three million, one hundred fifty-six thousand, four hundred twenty".