20339917 has 8 divisors (see below), whose sum is σ = 22205624. Its totient is φ = 18517248.

The previous prime is 20339909. The next prime is 20339941. The reversal of 20339917 is 71993302.

It can be written as a sum of positive squares in 4 ways, for example, as 8836 + 20331081 = 94^2 + 4509^2 .

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 20339917 - 2³ = 20339909 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 (20339947) 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, 9768 + ... + 11665.

It is an arithmetic number, because the mean of its divisors is an integer number (2775703).

Almost surely, 2^20339917 is an apocalyptic number.

It is an amenable number.

20339917 is a deficient number, since it is larger than the sum of its proper divisors (1865707).

20339917 is a wasteful number, since it uses less digits than its factorization.

20339917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21519.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 20339917 is about 4509.9797117060. The cubic root of 20339917 is about 272.9709254460.

The spelling of 20339917 in words is "twenty million, three hundred thirty-nine thousand, nine hundred seventeen".