23142720 has 56 divisors (see below), whose sum is σ = 73481184. Its totient is φ = 6171136.

The previous prime is 23142719. The next prime is 23142733. The reversal of 23142720 is 2724132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11094 + ... + 13013.

It is an arithmetic number, because the mean of its divisors is an integer number (1312164).

Almost surely, 2^23142720 is an apocalyptic number.

23142720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23142720 is an abundant number, since it is smaller than the sum of its proper divisors (50338464).

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

23142720 is a wasteful number, since it uses less digits than its factorization.

23142720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24127 (or 24117 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 23142720 is about 4810.6881004696. The cubic root of 23142720 is about 284.9737125646.

Adding to 23142720 its reverse (2724132), we get a palindrome (25866852).

The spelling of 23142720 in words is "twenty-three million, one hundred forty-two thousand, seven hundred twenty".