20398624 has 24 divisors (see below), whose sum is σ = 40291020. Its totient is φ = 10166016.

The previous prime is 20398579. The next prime is 20398627. The reversal of 20398624 is 42689302.

It can be written as a sum of positive squares in 2 ways, for example, as 19963024 + 435600 = 4468^2 + 660^2 .

It is a super-2 number, since 2×20398624² = 832207722186752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20398624.

It is not an unprimeable number, because it can be changed into a prime (20398627) 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, 11082 + ... + 12790.

Almost surely, 2^20398624 is an apocalyptic number.

It is an amenable number.

20398624 is a deficient number, since it is larger than the sum of its proper divisors (19892396).

20398624 is a wasteful number, since it uses less digits than its factorization.

20398624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092 (or 2084 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20398624 is about 4516.4835879255. The cubic root of 20398624 is about 273.2332980486.

The spelling of 20398624 in words is "twenty million, three hundred ninety-eight thousand, six hundred twenty-four".