19955712 has 128 divisors (see below), whose sum is σ = 62913600. Its totient is φ = 5505024.

The previous prime is 19955711. The next prime is 19955717. The reversal of 19955712 is 21755991.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (19955711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688114 + ... + 688142.

Almost surely, 2^19955712 is an apocalyptic number.

19955712 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 19955712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31456800).

19955712 is an abundant number, since it is smaller than the sum of its proper divisors (42957888).

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

19955712 is an frugal number, since it uses more digits than its factorization.

19955712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 41 counting only the distinct ones).

The product of its digits is 28350, while the sum is 39.

The square root of 19955712 is about 4467.1816618535. The cubic root of 19955712 is about 271.2412533724.

The spelling of 19955712 in words is "nineteen million, nine hundred fifty-five thousand, seven hundred twelve".