20124100 has 36 divisors (see below), whose sum is σ = 44504964. Its totient is φ = 7895680.

The previous prime is 20124079. The next prime is 20124101. The reversal of 20124100 is 142102.

It can be written as a sum of positive squares in 6 ways, for example, as 2534464 + 17589636 = 1592^2 + 4194^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20124101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3402 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (1236249).

Almost surely, 2^20124100 is an apocalyptic number.

20124100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20124100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22252482).

20124100 is an abundant number, since it is smaller than the sum of its proper divisors (24380864).

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

20124100 is a wasteful number, since it uses less digits than its factorization.

20124100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864 (or 3857 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 20124100 is about 4485.9893000318. The cubic root of 20124100 is about 272.0020364611.

Adding to 20124100 its reverse (142102), we get a palindrome (20266202).

The spelling of 20124100 in words is "twenty million, one hundred twenty-four thousand, one hundred".