13161620 has 24 divisors (see below), whose sum is σ = 27724200. Its totient is φ = 5248512.

The previous prime is 13161601. The next prime is 13161703. The reversal of 13161620 is 2616131.

It can be written as a sum of positive squares in 4 ways, for example, as 7862416 + 5299204 = 2804^2 + 2302^2 .

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 = 13161592 and 13161601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7376 + ... + 8984.

It is an arithmetic number, because the mean of its divisors is an integer number (1155175).

Almost surely, 2^13161620 is an apocalyptic number.

13161620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13161620 is an abundant number, since it is smaller than the sum of its proper divisors (14562580).

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

13161620 is a wasteful number, since it uses less digits than its factorization.

13161620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027 (or 2025 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13161620 is about 3627.8947063001. The cubic root of 13161620 is about 236.1038755594.

Adding to 13161620 its reverse (2616131), we get a palindrome (15777751).

The spelling of 13161620 in words is "thirteen million, one hundred sixty-one thousand, six hundred twenty".