15120020 has 48 divisors (see below), whose sum is σ = 33264000. Its totient is φ = 5765760.

The previous prime is 15120019. The next prime is 15120023. The reversal of 15120020 is 2002151.

It is a junction number, because it is equal to n+sod(n) for n = 15119983 and 15120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15120023) 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, 75881 + ... + 76079.

It is an arithmetic number, because the mean of its divisors is an integer number (693000).

Almost surely, 2^15120020 is an apocalyptic number.

15120020 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 15120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16632000).

15120020 is an abundant number, since it is smaller than the sum of its proper divisors (18143980).

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

15120020 is a wasteful number, since it uses less digits than its factorization.

15120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 15120020 is about 3888.4469907664. The cubic root of 15120020 is about 247.2772270172.

Adding to 15120020 its reverse (2002151), we get a palindrome (17122171).

The spelling of 15120020 in words is "fifteen million, one hundred twenty thousand, twenty".