13361220 has 96 divisors (see below), whose sum is σ = 42134400. Its totient is φ = 3514752.

The previous prime is 13361219. The next prime is 13361221. The reversal of 13361220 is 2216331.

13361220 is a `hidden beast` number, since 1 + 33 + 612 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (13361219) and next prime (13361221).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13361193 and 13361202.

It is not an unprimeable number, because it can be changed into a prime (13361221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58747 + ... + 58973.

It is an arithmetic number, because the mean of its divisors is an integer number (438900).

Almost surely, 2^13361220 is an apocalyptic number.

13361220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13361220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21067200).

13361220 is an abundant number, since it is smaller than the sum of its proper divisors (28773180).

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

13361220 is a wasteful number, since it uses less digits than its factorization.

13361220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 13361220 is about 3655.3002612645. The cubic root of 13361220 is about 237.2914216765.

Adding to 13361220 its reverse (2216331), we get a palindrome (15577551).

It can be divided in two parts, 1336 and 1220, that added together give a triangular number (2556 = T₇₁).

The spelling of 13361220 in words is "thirteen million, three hundred sixty-one thousand, two hundred twenty".