19953808 has 40 divisors (see below), whose sum is σ = 44495168. Its totient is φ = 8491392.

The previous prime is 19953797. The next prime is 19953821. The reversal of 19953808 is 80835991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17710 + ... + 18802.

Almost surely, 2^19953808 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 19953808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22247584).

19953808 is an abundant number, since it is smaller than the sum of its proper divisors (24541360).

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

19953808 is a wasteful number, since it uses less digits than its factorization.

19953808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 19953808 is about 4466.9685470126. The cubic root of 19953808 is about 271.2326266064.

The spelling of 19953808 in words is "nineteen million, nine hundred fifty-three thousand, eight hundred eight".