19696840 has 16 divisors (see below), whose sum is σ = 44317980. Its totient is φ = 7878720.

The previous prime is 19696837. The next prime is 19696841. The reversal of 19696840 is 4869691.

It can be written as a sum of positive squares in 2 ways, for example, as 19483396 + 213444 = 4414^2 + 462^2 .

It is not an unprimeable number, because it can be changed into a prime (19696841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246171 + ... + 246250.

Almost surely, 2^19696840 is an apocalyptic number.

19696840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19696840 is an abundant number, since it is smaller than the sum of its proper divisors (24621140).

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

19696840 is a wasteful number, since it uses less digits than its factorization.

19696840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492432 (or 492428 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 19696840 is about 4438.1122112898. The cubic root of 19696840 is about 270.0632682095.

The spelling of 19696840 in words is "nineteen million, six hundred ninety-six thousand, eight hundred forty".