20499456 has 44 divisors (see below), whose sum is σ = 54646712. Its totient is φ = 6832128.

The previous prime is 20499449. The next prime is 20499481. The reversal of 20499456 is 65499402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265 + ... + 6408.

Almost surely, 2^20499456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20499456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27323356).

20499456 is an abundant number, since it is smaller than the sum of its proper divisors (34147256).

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

20499456 is an equidigital number, since it uses as much as digits as its factorization.

20499456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696 (or 6678 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 20499456 is about 4527.6324939200. The cubic root of 20499456 is about 273.6827628284.

The spelling of 20499456 in words is "twenty million, four hundred ninety-nine thousand, four hundred fifty-six".