23721020 has 12 divisors (see below), whose sum is σ = 49814184. Its totient is φ = 9488400.

The previous prime is 23721017. The next prime is 23721023. The reversal of 23721020 is 2012732.

It is an interprime number because it is at equal distance from previous prime (23721017) and next prime (23721023).

It is a self number, because there is not a number n which added to its sum of digits gives 23721020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23721023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593006 + ... + 593045.

It is an arithmetic number, because the mean of its divisors is an integer number (4151182).

Almost surely, 2^23721020 is an apocalyptic number.

23721020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23721020 is an abundant number, since it is smaller than the sum of its proper divisors (26093164).

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

23721020 is a wasteful number, since it uses less digits than its factorization.

23721020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186060 (or 1186058 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 23721020 is about 4870.4229795779. The cubic root of 23721020 is about 287.3278919494.

Adding to 23721020 its reverse (2012732), we get a palindrome (25733752).

The spelling of 23721020 in words is "twenty-three million, seven hundred twenty-one thousand, twenty".