13240520 has 16 divisors (see below), whose sum is σ = 29791260. Its totient is φ = 5296192.

The previous prime is 13240519. The next prime is 13240523. The reversal of 13240520 is 2504231.

It can be written as a sum of positive squares in 2 ways, for example, as 13235044 + 5476 = 3638^2 + 74^2 .

It is a super-2 number, since 2×13240520² = 350622739740800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13240523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165467 + ... + 165546.

Almost surely, 2^13240520 is an apocalyptic number.

13240520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13240520 is an abundant number, since it is smaller than the sum of its proper divisors (16550740).

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

13240520 is a wasteful number, since it uses less digits than its factorization.

13240520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331024 (or 331020 counting only the distinct ones).

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

The square root of 13240520 is about 3638.7525334928. The cubic root of 13240520 is about 236.5747267910.

Adding to 13240520 its reverse (2504231), we get a palindrome (15744751).

The spelling of 13240520 in words is "thirteen million, two hundred forty thousand, five hundred twenty".