23390520 has 64 divisors (see below), whose sum is σ = 73872000. Its totient is φ = 5908608.

The previous prime is 23390519. The next prime is 23390527. The reversal of 23390520 is 2509332.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23390527) 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, 2850 + ... + 7409.

It is an arithmetic number, because the mean of its divisors is an integer number (1154250).

Almost surely, 2^23390520 is an apocalyptic number.

23390520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23390520 is an abundant number, since it is smaller than the sum of its proper divisors (50481480).

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

23390520 is a wasteful number, since it uses less digits than its factorization.

23390520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10292 (or 10288 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 23390520 is about 4836.3746753121. The cubic root of 23390520 is about 285.9872196679.

Adding to 23390520 its reverse (2509332), we get a palindrome (25899852).

The spelling of 23390520 in words is "twenty-three million, three hundred ninety thousand, five hundred twenty".