19959912 has 128 divisors (see below), whose sum is σ = 65049600. Its totient is φ = 5552064.

The previous prime is 19959911. The next prime is 19959931. The reversal of 19959912 is 21995991.

It is not an unprimeable number, because it can be changed into a prime (19959911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64863 + ... + 65169.

It is an arithmetic number, because the mean of its divisors is an integer number (508200).

Almost surely, 2^19959912 is an apocalyptic number.

19959912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19959912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32524800).

19959912 is an abundant number, since it is smaller than the sum of its proper divisors (45089688).

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

19959912 is a wasteful number, since it uses less digits than its factorization.

19959912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 362 counting only the distinct ones).

The product of its digits is 65610, while the sum is 45.

The square root of 19959912 is about 4467.6517321743. The cubic root of 19959912 is about 271.2602810632.

The spelling of 19959912 in words is "nineteen million, nine hundred fifty-nine thousand, nine hundred twelve".