15517120020 has 24 divisors (see below), whose sum is σ = 43447936224. Its totient is φ = 4137898656.

The previous prime is 15517120019. The next prime is 15517120049. The reversal of 15517120020 is 2002171551.

15517120020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 129309274 + ... + 129309393.

It is an arithmetic number, because the mean of its divisors is an integer number (1810330676).

Almost surely, 2^15517120020 is an apocalyptic number.

15517120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15517120020 is an abundant number, since it is smaller than the sum of its proper divisors (27930816204).

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

15517120020 is a wasteful number, since it uses less digits than its factorization.

15517120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258618679 (or 258618677 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

Adding to 15517120020 its reverse (2002171551), we get a palindrome (17519291571).

The spelling of 15517120020 in words is "fifteen billion, five hundred seventeen million, one hundred twenty thousand, twenty".