23157420 has 96 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 5180160.

The previous prime is 23157419. The next prime is 23157437. The reversal of 23157420 is 2475132.

It is a super-2 number, since 2×23157420² = 1072532202112800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7231 + ... + 9929.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^23157420 is an apocalyptic number.

23157420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23157420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38102400).

23157420 is an abundant number, since it is smaller than the sum of its proper divisors (53047380).

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

23157420 is a wasteful number, since it uses less digits than its factorization.

23157420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2733 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 23157420 is about 4812.2157058885. The cubic root of 23157420 is about 285.0340371783.

The spelling of 23157420 in words is "twenty-three million, one hundred fifty-seven thousand, four hundred twenty".