13257620 has 24 divisors (see below), whose sum is σ = 29479464. Its totient is φ = 4990976.

The previous prime is 13257599. The next prime is 13257653. The reversal of 13257620 is 2675231.

It can be written as a sum of positive squares in 4 ways, for example, as 1547536 + 11710084 = 1244^2 + 3422^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13257620.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19157 + ... + 19836.

It is an arithmetic number, because the mean of its divisors is an integer number (1228311).

Almost surely, 2^13257620 is an apocalyptic number.

13257620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13257620 is an abundant number, since it is smaller than the sum of its proper divisors (16221844).

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

13257620 is a wasteful number, since it uses less digits than its factorization.

13257620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39019 (or 39017 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 13257620 is about 3641.1014816948. The cubic root of 13257620 is about 236.6765276149.

The spelling of 13257620 in words is "thirteen million, two hundred fifty-seven thousand, six hundred twenty".