15221920 has 48 divisors (see below), whose sum is σ = 41102208. Its totient is φ = 5218560.

The previous prime is 15221917. The next prime is 15221963. The reversal of 15221920 is 2912251.

It is a super-3 number, since 3×15221920³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15221891 and 15221900.

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, 5676 + ... + 7915.

It is an arithmetic number, because the mean of its divisors is an integer number (856296).

Almost surely, 2^15221920 is an apocalyptic number.

15221920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15221920 is an abundant number, since it is smaller than the sum of its proper divisors (25880288).

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

15221920 is a wasteful number, since it uses less digits than its factorization.

15221920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13613 (or 13605 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 15221920 is about 3901.5279058338. The cubic root of 15221920 is about 247.8314845488.

The spelling of 15221920 in words is "fifteen million, two hundred twenty-one thousand, nine hundred twenty".