15540450220 has 48 divisors (see below), whose sum is σ = 33108445440. Its totient is φ = 6126355136.

The previous prime is 15540450209. The next prime is 15540450259. The reversal of 15540450220 is 2205404551.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684369 + ... + 706711.

It is an arithmetic number, because the mean of its divisors is an integer number (689759280).

Almost surely, 2^15540450220 is an apocalyptic number.

15540450220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15540450220 is an abundant number, since it is smaller than the sum of its proper divisors (17567995220).

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

15540450220 is a wasteful number, since it uses less digits than its factorization.

15540450220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22854 (or 22852 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 15540450220 its reverse (2205404551), we get a palindrome (17745854771).

The spelling of 15540450220 in words is "fifteen billion, five hundred forty million, four hundred fifty thousand, two hundred twenty".