15513531220 has 48 divisors (see below), whose sum is σ = 37630692288. Its totient is φ = 5309442560.

The previous prime is 15513531197. The next prime is 15513531223. The reversal of 15513531220 is 2213531551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15513531223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2070262 + ... + 2077741.

It is an arithmetic number, because the mean of its divisors is an integer number (783972756).

Almost surely, 2^15513531220 is an apocalyptic number.

15513531220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15513531220 is an abundant number, since it is smaller than the sum of its proper divisors (22117161068).

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

15513531220 is a wasteful number, since it uses less digits than its factorization.

15513531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148040 (or 4148038 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

It can be divided in two parts, 155135 and 31220, that added together give a triangular number (186355 = T₆₁₀).

The spelling of 15513531220 in words is "fifteen billion, five hundred thirteen million, five hundred thirty-one thousand, two hundred twenty".