15220825 has 24 divisors (see below), whose sum is σ = 19963008. Its totient is φ = 11489280.

The previous prime is 15220819. The next prime is 15220841. The reversal of 15220825 is 52802251.

It is not a de Polignac number, because 15220825 - 2⁷ = 15220697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15220825.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59097 + ... + 59353.

It is an arithmetic number, because the mean of its divisors is an integer number (831792).

Almost surely, 2^15220825 is an apocalyptic number.

It is an amenable number.

15220825 is a deficient number, since it is larger than the sum of its proper divisors (4742183).

15220825 is a wasteful number, since it uses less digits than its factorization.

15220825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 15220825 is about 3901.3875736717. The cubic root of 15220825 is about 247.8255417597.

The spelling of 15220825 in words is "fifteen million, two hundred twenty thousand, eight hundred twenty-five".