19959968 has 24 divisors (see below), whose sum is σ = 44910432. Its totient is φ = 8554176.

The previous prime is 19959949. The next prime is 19959977. The reversal of 19959968 is 86995991.

It is a super-2 number, since 2×19959968² = 796800645122048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44330 + ... + 44777.

It is an arithmetic number, because the mean of its divisors is an integer number (1871268).

Almost surely, 2^19959968 is an apocalyptic number.

It is an amenable number.

19959968 is an abundant number, since it is smaller than the sum of its proper divisors (24950464).

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

19959968 is an equidigital number, since it uses as much as digits as its factorization.

19959968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89124 (or 89116 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 56.

The square root of 19959968 is about 4467.6579994445. The cubic root of 19959968 is about 271.2605347477.

The spelling of 19959968 in words is "nineteen million, nine hundred fifty-nine thousand, nine hundred sixty-eight".