20199456 has 60 divisors (see below), whose sum is σ = 59413662. Its totient is φ = 6732288.

The previous prime is 20199437. The next prime is 20199481. The reversal of 20199456 is 65499102.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 8503056 = 3420^2 + 2916^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20199456.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1305 + ... + 6488.

Almost surely, 2^20199456 is an apocalyptic number.

It is an amenable number.

20199456 is an abundant number, since it is smaller than the sum of its proper divisors (39214206).

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

20199456 is an equidigital number, since it uses as much as digits as its factorization.

20199456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7815 (or 7798 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20199456 is about 4494.3804912357. The cubic root of 20199456 is about 272.3411233346.

The spelling of 20199456 in words is "twenty million, one hundred ninety-nine thousand, four hundred fifty-six".