20324400 has 60 divisors (see below), whose sum is σ = 65109672. Its totient is φ = 5419520.

The previous prime is 20324399. The next prime is 20324413. The reversal of 20324400 is 442302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20324400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7269 + ... + 9668.

Almost surely, 2^20324400 is an apocalyptic number.

20324400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20324400 is an abundant number, since it is smaller than the sum of its proper divisors (44785272).

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

20324400 is a wasteful number, since it uses less digits than its factorization.

20324400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16958 (or 16947 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20324400 is about 4508.2590874971. The cubic root of 20324400 is about 272.9014927238.

Adding to 20324400 its reverse (442302), we get a palindrome (20766702).

The spelling of 20324400 in words is "twenty million, three hundred twenty-four thousand, four hundred".