20969317 has 8 divisors (see below), whose sum is σ = 21307392. Its totient is φ = 20634000.

The previous prime is 20969309. The next prime is 20969321. The reversal of 20969317 is 71396902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20969317 - 2³ = 20969309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18748 + ... + 19834.

It is an arithmetic number, because the mean of its divisors is an integer number (2663424).

Almost surely, 2^20969317 is an apocalyptic number.

It is an amenable number.

20969317 is a deficient number, since it is larger than the sum of its proper divisors (338075).

20969317 is a wasteful number, since it uses less digits than its factorization.

20969317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20969317 is about 4579.2266814387. The cubic root of 20969317 is about 275.7579837774.

The spelling of 20969317 in words is "twenty million, nine hundred sixty-nine thousand, three hundred seventeen".