15520120 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 4836480.

The previous prime is 15520111. The next prime is 15520121. The reversal of 15520120 is 2102551.

It is a junction number, because it is equal to n+sod(n) for n = 15520094 and 15520103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15520121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561 + ... + 5599.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^15520120 is an apocalyptic number.

15520120 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 15520120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21772800).

15520120 is an abundant number, since it is smaller than the sum of its proper divisors (28025480).

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

15520120 is a wasteful number, since it uses less digits than its factorization.

15520120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068 (or 5064 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 15520120 is about 3939.5583508815. The cubic root of 15520120 is about 249.4393837775.

Adding to 15520120 its reverse (2102551), we get a palindrome (17622671).

Subtracting from 15520120 its reverse (2102551), we obtain a square (13417569 = 3663²).

The spelling of 15520120 in words is "fifteen million, five hundred twenty thousand, one hundred twenty".