15220424 has 16 divisors (see below), whose sum is σ = 28860300. Its totient is φ = 7524352.

The previous prime is 15220421. The next prime is 15220441. The reversal of 15220424 is 42402251.

It is a happy number.

15220424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12602500 + 2617924 = 3550^2 + 1618^2 .

It is a super-2 number, since 2×15220424² = 463322613479552, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15220396 and 15220405.

It is not an unprimeable number, because it can be changed into a prime (15220421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9977 + ... + 11400.

Almost surely, 2^15220424 is an apocalyptic number.

It is an amenable number.

15220424 is a deficient number, since it is larger than the sum of its proper divisors (13639876).

15220424 is a wasteful number, since it uses less digits than its factorization.

15220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21472 (or 21468 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15220424 is about 3901.3361813615. The cubic root of 15220424 is about 247.8233653793.

Adding to 15220424 its reverse (42402251), we get a palindrome (57622675).

The spelling of 15220424 in words is "fifteen million, two hundred twenty thousand, four hundred twenty-four".