20969619 has 16 divisors (see below), whose sum is σ = 32296320. Its totient is φ = 11960960.

The previous prime is 20969527. The next prime is 20969623. The reversal of 20969619 is 91696902.

It is a happy number.

It is not a de Polignac number, because 20969619 - 2⁹ = 20969107 is a prime.

It is a super-2 number, since 2×20969619² = 879449842010322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20969119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18129 + ... + 19250.

It is an arithmetic number, because the mean of its divisors is an integer number (2018520).

Almost surely, 2^20969619 is an apocalyptic number.

20969619 is a deficient number, since it is larger than the sum of its proper divisors (11326701).

20969619 is a wasteful number, since it uses less digits than its factorization.

20969619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37410.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20969619 is about 4579.2596563200. The cubic root of 20969619 is about 275.7593075928.

The spelling of 20969619 in words is "twenty million, nine hundred sixty-nine thousand, six hundred nineteen".