20122800 has 120 divisors (see below), whose sum is σ = 66193680. Its totient is φ = 5222400.

The previous prime is 20122787. The next prime is 20122807. The reversal of 20122800 is 822102.

It is a tau number, because it is divible by the number of its divisors (120).

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 20122800.

It is not an unprimeable number, because it can be changed into a prime (20122807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48996 + ... + 49404.

It is an arithmetic number, because the mean of its divisors is an integer number (551614).

Almost surely, 2^20122800 is an apocalyptic number.

20122800 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 20122800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33096840).

20122800 is an abundant number, since it is smaller than the sum of its proper divisors (46070880).

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

20122800 is a wasteful number, since it uses less digits than its factorization.

20122800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20122800 is about 4485.8444021165. The cubic root of 20122800 is about 271.9961793004.

Adding to 20122800 its reverse (822102), we get a palindrome (20944902).

The spelling of 20122800 in words is "twenty million, one hundred twenty-two thousand, eight hundred".