19938516 has 48 divisors (see below), whose sum is σ = 52289664. Its totient is φ = 5867136.

The previous prime is 19938473. The next prime is 19938517. The reversal of 19938516 is 61583991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810 + ... + 6366.

It is an arithmetic number, because the mean of its divisors is an integer number (1089368).

Almost surely, 2^19938516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19938516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26144832).

19938516 is an abundant number, since it is smaller than the sum of its proper divisors (32351148).

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

19938516 is a wasteful number, since it uses less digits than its factorization.

19938516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5600 (or 5598 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 19938516 is about 4465.2565435818. The cubic root of 19938516 is about 271.1633207153.

The spelling of 19938516 in words is "nineteen million, nine hundred thirty-eight thousand, five hundred sixteen".