23557820 has 48 divisors (see below), whose sum is σ = 58127328. Its totient is φ = 7906560.

The previous prime is 23557817. The next prime is 23557823. The reversal of 23557820 is 2875532.

It is an interprime number because it is at equal distance from previous prime (23557817) and next prime (23557823).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23557823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1259 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (1210986).

Almost surely, 2^23557820 is an apocalyptic number.

23557820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23557820 is an abundant number, since it is smaller than the sum of its proper divisors (34569508).

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

23557820 is a wasteful number, since it uses less digits than its factorization.

23557820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8270 (or 8268 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 23557820 is about 4853.6398712719. The cubic root of 23557820 is about 286.6674388538.

The spelling of 23557820 in words is "twenty-three million, five hundred fifty-seven thousand, eight hundred twenty".