23212520 has 48 divisors (see below), whose sum is σ = 54647460. Its totient is φ = 8873216.

The previous prime is 23212517. The next prime is 23212523. The reversal of 23212520 is 2521232.

It is an interprime number because it is at equal distance from previous prime (23212517) and next prime (23212523).

It can be written as a sum of positive squares in 2 ways, for example, as 22448644 + 763876 = 4738^2 + 874^2 .

It is not an unprimeable number, because it can be changed into a prime (23212523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20612 + ... + 21708.

Almost surely, 2^23212520 is an apocalyptic number.

23212520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23212520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27323730).

23212520 is an abundant number, since it is smaller than the sum of its proper divisors (31434940).

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

23212520 is a wasteful number, since it uses less digits than its factorization.

23212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 23212520 is about 4817.9373179816. The cubic root of 23212520 is about 285.2599249730.

Adding to 23212520 its reverse (2521232), we get a palindrome (25733752).

It can be divided in two parts, 23212 and 520, that added together give a palindrome (23732).

The spelling of 23212520 in words is "twenty-three million, two hundred twelve thousand, five hundred twenty".