13561320 has 32 divisors (see below), whose sum is σ = 40684320. Its totient is φ = 3616320.

The previous prime is 13561319. The next prime is 13561321. The reversal of 13561320 is 2316531.

13561320 = T₃₆₀ + T₃₆₁ + ... + T₅₀₃.

It is an interprime number because it is at equal distance from previous prime (13561319) and next prime (13561321).

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (13561321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56386 + ... + 56625.

It is an arithmetic number, because the mean of its divisors is an integer number (1271385).

Almost surely, 2^13561320 is an apocalyptic number.

13561320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13561320 is an abundant number, since it is smaller than the sum of its proper divisors (27123000).

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

13561320 is a wasteful number, since it uses less digits than its factorization.

13561320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113025 (or 113021 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 13561320 is about 3682.5697549402. The cubic root of 13561320 is about 238.4701297366.

Adding to 13561320 its reverse (2316531), we get a palindrome (15877851).

The spelling of 13561320 in words is "thirteen million, five hundred sixty-one thousand, three hundred twenty".