19916344 has 72 divisors (see below), whose sum is σ = 46313640. Its totient is φ = 7990752.

The previous prime is 19916329. The next prime is 19916381. The reversal of 19916344 is 44361991.

19916344 = T₈₉₇ + T₈₉₈ + ... + T₉₄₃.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 423729 + ... + 423775.

It is an arithmetic number, because the mean of its divisors is an integer number (643245).

Almost surely, 2^19916344 is an apocalyptic number.

19916344 is a gapful number since it is divisible by the number (14) 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 19916344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23156820).

19916344 is an abundant number, since it is smaller than the sum of its proper divisors (26397296).

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

19916344 is a wasteful number, since it uses less digits than its factorization.

19916344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 79 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 19916344 is about 4462.7731288964. The cubic root of 19916344 is about 271.0627705524.

The spelling of 19916344 in words is "nineteen million, nine hundred sixteen thousand, three hundred forty-four".