23135720 has 32 divisors (see below), whose sum is σ = 53269920. Its totient is φ = 9038400.

The previous prime is 23135713. The next prime is 23135737. The reversal of 23135720 is 2753132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5006 + ... + 8445.

It is an arithmetic number, because the mean of its divisors is an integer number (1664685).

Almost surely, 2^23135720 is an apocalyptic number.

23135720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23135720 is an abundant number, since it is smaller than the sum of its proper divisors (30134200).

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

23135720 is a wasteful number, since it uses less digits than its factorization.

23135720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13505 (or 13501 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 23135720 is about 4809.9604987983. The cubic root of 23135720 is about 284.9449775795.

Adding to 23135720 its reverse (2753132), we get a palindrome (25888852).

The spelling of 23135720 in words is "twenty-three million, one hundred thirty-five thousand, seven hundred twenty".