20899400 has 48 divisors (see below), whose sum is σ = 49215600. Its totient is φ = 8252480.

The previous prime is 20899379. The next prime is 20899423. The reversal of 20899400 is 499802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15971 + ... + 17229.

It is an arithmetic number, because the mean of its divisors is an integer number (1025325).

Almost surely, 2^20899400 is an apocalyptic number.

20899400 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 20899400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24607800).

20899400 is an abundant number, since it is smaller than the sum of its proper divisors (28316200).

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

20899400 is a wasteful number, since it uses less digits than its factorization.

20899400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20899400 is about 4571.5861579981. The cubic root of 20899400 is about 275.4511602559.

The spelling of 20899400 in words is "twenty million, eight hundred ninety-nine thousand, four hundred".