23720931 has 28 divisors (see below), whose sum is σ = 38316208. Its totient is φ = 14591664.

The previous prime is 23720923. The next prime is 23720941. The reversal of 23720931 is 13902732.

It is not a de Polignac number, because 23720931 - 2³ = 23720923 is a prime.

It is a super-2 number, since 2×23720931² = 1125365135013522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23720895 and 23720904.

It is not an unprimeable number, because it can be changed into a prime (23720941) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 8226 + ... + 10728.

It is an arithmetic number, because the mean of its divisors is an integer number (1368436).

Almost surely, 2^23720931 is an apocalyptic number.

23720931 is a deficient number, since it is larger than the sum of its proper divisors (14595277).

23720931 is an equidigital number, since it uses as much as digits as its factorization.

23720931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 23720931 is about 4870.4138427858. The cubic root of 23720931 is about 287.3275326027.

The spelling of 23720931 in words is "twenty-three million, seven hundred twenty thousand, nine hundred thirty-one".