13215620 has 72 divisors (see below), whose sum is σ = 31460352. Its totient is φ = 4656960.

The previous prime is 13215617. The next prime is 13215661. The reversal of 13215620 is 2651231.

It is a super-2 number, since 2×13215620² = 349305223968800, 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 = 13215592 and 13215601.

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 23 ways as a sum of consecutive naturals, for example, 103997 + ... + 104123.

Almost surely, 2^13215620 is an apocalyptic number.

13215620 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 13215620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15730176).

13215620 is an abundant number, since it is smaller than the sum of its proper divisors (18244732).

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

13215620 is a wasteful number, since it uses less digits than its factorization.

13215620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 188 counting only the distinct ones).

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

The square root of 13215620 is about 3635.3294211117. The cubic root of 13215620 is about 236.4263336455.

Adding to 13215620 its reverse (2651231), we get a palindrome (15866851).

The spelling of 13215620 in words is "thirteen million, two hundred fifteen thousand, six hundred twenty".