20124400 has 30 divisors (see below), whose sum is σ = 48349832. Its totient is φ = 8049600.

The previous prime is 20124397. The next prime is 20124407. The reversal of 20124400 is 442102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124407) 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 5 ways as a sum of consecutive naturals, for example, 24756 + ... + 25555.

Almost surely, 2^20124400 is an apocalyptic number.

20124400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20124400 is an abundant number, since it is smaller than the sum of its proper divisors (28225432).

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

20124400 is a wasteful number, since it uses less digits than its factorization.

20124400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50329 (or 50318 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20124400 is about 4486.0227373476. The cubic root of 20124400 is about 272.0033880778.

Adding to 20124400 its reverse (442102), we get a palindrome (20566502).

The spelling of 20124400 in words is "twenty million, one hundred twenty-four thousand, four hundred".