19918872 has 80 divisors (see below), whose sum is σ = 56845800. Its totient is φ = 6514560.

The previous prime is 19918753. The next prime is 19918901. The reversal of 19918872 is 27881991.

It is a super-2 number, since 2×19918872² = 793522923504768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37972 + ... + 38492.

Almost surely, 2^19918872 is an apocalyptic number.

19918872 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 19918872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28422900).

19918872 is an abundant number, since it is smaller than the sum of its proper divisors (36926928).

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

19918872 is a wasteful number, since it uses less digits than its factorization.

19918872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 585 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 19918872 is about 4463.0563518737. The cubic root of 19918872 is about 271.0742388167.

The spelling of 19918872 in words is "nineteen million, nine hundred eighteen thousand, eight hundred seventy-two".