19995969 has 12 divisors (see below), whose sum is σ = 31014384. Its totient is φ = 11426184.

The previous prime is 19995967. The next prime is 19995973. The reversal of 19995969 is 96959991.

It is not a de Polignac number, because 19995969 - 2¹ = 19995967 is a prime.

It is a super-2 number, since 2×19995969² = 799677552497922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19995967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67867 + ... + 68160.

It is an arithmetic number, because the mean of its divisors is an integer number (2584532).

Almost surely, 2^19995969 is an apocalyptic number.

It is an amenable number.

19995969 is a deficient number, since it is larger than the sum of its proper divisors (11018415).

19995969 is a wasteful number, since it uses less digits than its factorization.

19995969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136044 (or 136037 counting only the distinct ones).

The product of its digits is 1771470, while the sum is 57.

The square root of 19995969 is about 4471.6852527878. The cubic root of 19995969 is about 271.4235240718.

It can be divided in two parts, 199959 and 69, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 19995969 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred sixty-nine".