19696985 has 24 divisors (see below), whose sum is σ = 29698368. Its totient is φ = 12276000.

The previous prime is 19696969. The next prime is 19697021. The reversal of 19696985 is 58969691.

19696985 = 5² + 6² + ... + 389².

It is not a de Polignac number, because 19696985 - 2⁴ = 19696969 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1910 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (1237432).

Almost surely, 2^19696985 is an apocalyptic number.

It is an amenable number.

19696985 is a deficient number, since it is larger than the sum of its proper divisors (10001383).

19696985 is a wasteful number, since it uses less digits than its factorization.

19696985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685 (or 4674 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 53.

The square root of 19696985 is about 4438.1285470342. The cubic root of 19696985 is about 270.0639309060.

The spelling of 19696985 in words is "nineteen million, six hundred ninety-six thousand, nine hundred eighty-five".