15550342220 has 96 divisors (see below), whose sum is σ = 37967892480. Its totient is φ = 5239491840.

The previous prime is 15550342219. The next prime is 15550342261. The reversal of 15550342220 is 2224305551.

It is a super-2 number, since 2×15550342220² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4491290 + ... + 4494750.

It is an arithmetic number, because the mean of its divisors is an integer number (395498880).

Almost surely, 2^15550342220 is an apocalyptic number.

15550342220 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 15550342220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18983946240).

15550342220 is an abundant number, since it is smaller than the sum of its proper divisors (22417550260).

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

15550342220 is a wasteful number, since it uses less digits than its factorization.

15550342220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023 (or 4021 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 15550342220 its reverse (2224305551), we get a palindrome (17774647771).

The spelling of 15550342220 in words is "fifteen billion, five hundred fifty million, three hundred forty-two thousand, two hundred twenty".