19764816 has 40 divisors (see below), whose sum is σ = 52151424. Its totient is φ = 6447360.

The previous prime is 19764779. The next prime is 19764839. The reversal of 19764816 is 61846791.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2125 + ... + 6636.

Almost surely, 2^19764816 is an apocalyptic number.

19764816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19764816 is an abundant number, since it is smaller than the sum of its proper divisors (32386608).

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

19764816 is a wasteful number, since it uses less digits than its factorization.

19764816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819 (or 8813 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 19764816 is about 4445.7638263857. The cubic root of 19764816 is about 270.3735843621.

The spelling of 19764816 in words is "nineteen million, seven hundred sixty-four thousand, eight hundred sixteen".