12531620 has 12 divisors (see below), whose sum is σ = 26316444. Its totient is φ = 5012640.

The previous prime is 12531593. The next prime is 12531637. The reversal of 12531620 is 2613521.

It can be written as a sum of positive squares in 2 ways, for example, as 9634816 + 2896804 = 3104^2 + 1702^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 626581 = 12531620 / (1 + 2 + 5 + 3 + 1 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 12531592 and 12531601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313271 + ... + 313310.

It is an arithmetic number, because the mean of its divisors is an integer number (2193037).

Almost surely, 2^12531620 is an apocalyptic number.

12531620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12531620 is an abundant number, since it is smaller than the sum of its proper divisors (13784824).

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

12531620 is a wasteful number, since it uses less digits than its factorization.

12531620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626590 (or 626588 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 12531620 is about 3540.0028248576. The cubic root of 12531620 is about 232.2749662921.

Subtracting from 12531620 its sum of digits (20), we obtain a square (12531600 = 3540²).

The spelling of 12531620 in words is "twelve million, five hundred thirty-one thousand, six hundred twenty".