15221980 has 24 divisors (see below), whose sum is σ = 32118912. Its totient is φ = 6059712.

The previous prime is 15221963. The next prime is 15222041. The reversal of 15221980 is 8912251.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 6166.

It is an arithmetic number, because the mean of its divisors is an integer number (1338288).

Almost surely, 2^15221980 is an apocalyptic number.

15221980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15221980 is an abundant number, since it is smaller than the sum of its proper divisors (16896932).

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

15221980 is a wasteful number, since it uses less digits than its factorization.

15221980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645 (or 3643 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 15221980 is about 3901.5355951215. The cubic root of 15221980 is about 247.8318101729.

The spelling of 15221980 in words is "fifteen million, two hundred twenty-one thousand, nine hundred eighty".