15520639920 has 320 divisors, whose sum is σ = 51146726400. Its totient is φ = 3887493120.

The previous prime is 15520639879. The next prime is 15520639931. The reversal of 15520639920 is 2993602551.

15520639920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 59013709 + ... + 59013971.

It is an arithmetic number, because the mean of its divisors is an integer number (159833520).

Almost surely, 2^15520639920 is an apocalyptic number.

15520639920 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 15520639920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25573363200).

15520639920 is an abundant number, since it is smaller than the sum of its proper divisors (35626086480).

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

15520639920 is a wasteful number, since it uses less digits than its factorization.

15520639920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The spelling of 15520639920 in words is "fifteen billion, five hundred twenty million, six hundred thirty-nine thousand, nine hundred twenty".