20912200 has 24 divisors (see below), whose sum is σ = 48621330. Its totient is φ = 8364800.

The previous prime is 20912191. The next prime is 20912207. The reversal of 20912200 is 221902.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13060996 + 7851204 = 3614^2 + 2802^2 .

It is not an unprimeable number, because it can be changed into a prime (20912207) 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, 52081 + ... + 52480.

Almost surely, 2^20912200 is an apocalyptic number.

20912200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20912200 is an abundant number, since it is smaller than the sum of its proper divisors (27709130).

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

20912200 is a wasteful number, since it uses less digits than its factorization.

20912200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104577 (or 104568 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20912200 is about 4572.9858954517. The cubic root of 20912200 is about 275.5073828477.

It can be divided in two parts, 20912 and 200, that added together give a palindrome (21112).

The spelling of 20912200 in words is "twenty million, nine hundred twelve thousand, two hundred".