15225620 has 24 divisors (see below), whose sum is σ = 32261544. Its totient is φ = 6035456.

The previous prime is 15225607. The next prime is 15225629. The reversal of 15225620 is 2652251.

It can be written as a sum of positive squares in 4 ways, for example, as 16 + 15225604 = 4^2 + 3902^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15225629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109 + ... + 5628.

It is an arithmetic number, because the mean of its divisors is an integer number (1344231).

Almost surely, 2^15225620 is an apocalyptic number.

15225620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15225620 is an abundant number, since it is smaller than the sum of its proper divisors (17035924).

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

15225620 is a wasteful number, since it uses less digits than its factorization.

15225620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6859 (or 6857 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 15225620 is about 3902.0020502301. The cubic root of 15225620 is about 247.8515630980.

Adding to 15225620 its reverse (2652251), we get a palindrome (17877871).

The spelling of 15225620 in words is "fifteen million, two hundred twenty-five thousand, six hundred twenty".