15505980 has 48 divisors (see below), whose sum is σ = 49620480. Its totient is φ = 3544128.

The previous prime is 15505969. The next prime is 15505993. The reversal of 15505980 is 8950551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18040 + ... + 18879.

It is an arithmetic number, because the mean of its divisors is an integer number (1033760).

Almost surely, 2^15505980 is an apocalyptic number.

15505980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15505980 is an abundant number, since it is smaller than the sum of its proper divisors (34114500).

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

15505980 is a wasteful number, since it uses less digits than its factorization.

15505980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36938 (or 36936 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 33.

The square root of 15505980 is about 3937.7633245283. The cubic root of 15505980 is about 249.3636080625.

The spelling of 15505980 in words is "fifteen million, five hundred five thousand, nine hundred eighty".