15500245220 has 24 divisors (see below), whose sum is σ = 34263700800. Its totient is φ = 5873776992.

The previous prime is 15500245213. The next prime is 15500245237. The reversal of 15500245220 is 2254200551.

It is a super-3 number, since 3×15500245220³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15500245220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20394680 + ... + 20395439.

It is an arithmetic number, because the mean of its divisors is an integer number (1427654200).

Almost surely, 2^15500245220 is an apocalyptic number.

15500245220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15500245220 is an abundant number, since it is smaller than the sum of its proper divisors (18763455580).

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

15500245220 is a wasteful number, since it uses less digits than its factorization.

15500245220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40790147 (or 40790145 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 15500245220 its reverse (2254200551), we get a palindrome (17754445771).

The spelling of 15500245220 in words is "fifteen billion, five hundred million, two hundred forty-five thousand, two hundred twenty".