19690965 has 64 divisors (see below), whose sum is σ = 40734720. Its totient is φ = 8838720.

The previous prime is 19690961. The next prime is 19690991. The reversal of 19690965 is 56909691.

It is not a de Polignac number, because 19690965 - 2² = 19690961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19690965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19690961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63160 + ... + 63470.

It is an arithmetic number, because the mean of its divisors is an integer number (636480).

Almost surely, 2^19690965 is an apocalyptic number.

19690965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19690965 is an abundant number, since it is smaller than the sum of its proper divisors (21043755).

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

19690965 is a wasteful number, since it uses less digits than its factorization.

19690965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 19690965 is about 4437.4502814116. The cubic root of 19690965 is about 270.0364148416.

The spelling of 19690965 in words is "nineteen million, six hundred ninety thousand, nine hundred sixty-five".