13156220 has 48 divisors (see below), whose sum is σ = 34449408. Its totient is φ = 4100160.

The previous prime is 13156163. The next prime is 13156259. The reversal of 13156220 is 2265131.

It is a super-2 number, since 2×13156220² = 346172249376800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13156192 and 13156201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2732 + ... + 5811.

It is an arithmetic number, because the mean of its divisors is an integer number (717696).

Almost surely, 2^13156220 is an apocalyptic number.

13156220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13156220 is an abundant number, since it is smaller than the sum of its proper divisors (21293188).

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

13156220 is a wasteful number, since it uses less digits than its factorization.

13156220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570 (or 8568 counting only the distinct ones).

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

The square root of 13156220 is about 3627.1503966613. The cubic root of 13156220 is about 236.0715812741.

The spelling of 13156220 in words is "thirteen million, one hundred fifty-six thousand, two hundred twenty".