20157224 has 16 divisors (see below), whose sum is σ = 38068800. Its totient is φ = 10005552.

The previous prime is 20157211. The next prime is 20157229. The reversal of 20157224 is 42275102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20157224.

It is not an unprimeable number, because it can be changed into a prime (20157229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7952 + ... + 10175.

It is an arithmetic number, because the mean of its divisors is an integer number (2379300).

Almost surely, 2^20157224 is an apocalyptic number.

It is an amenable number.

20157224 is a deficient number, since it is larger than the sum of its proper divisors (17911576).

20157224 is a wasteful number, since it uses less digits than its factorization.

20157224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18272 (or 18268 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20157224 is about 4489.6797213164. The cubic root of 20157224 is about 272.1511918956.

The spelling of 20157224 in words is "twenty million, one hundred fifty-seven thousand, two hundred twenty-four".