19801456 has 20 divisors (see below), whose sum is σ = 38448432. Its totient is φ = 9879296.

The previous prime is 19801427. The next prime is 19801471. The reversal of 19801456 is 65410891.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8445 + ... + 10531.

Almost surely, 2^19801456 is an apocalyptic number.

19801456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19801456 is a deficient number, since it is larger than the sum of its proper divisors (18646976).

19801456 is a wasteful number, since it uses less digits than its factorization.

19801456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688 (or 2682 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 19801456 is about 4449.8826950831. The cubic root of 19801456 is about 270.5405540062.

The spelling of 19801456 in words is "nineteen million, eight hundred one thousand, four hundred fifty-six".