20290917 has 16 divisors (see below), whose sum is σ = 28712960. Its totient is φ = 12709872.

The previous prime is 20290909. The next prime is 20290931. The reversal of 20290917 is 71909202.

It is not a de Polignac number, because 20290917 - 2³ = 20290909 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 (20290967) 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, 5838 + ... + 8640.

It is an arithmetic number, because the mean of its divisors is an integer number (1794560).

Almost surely, 2^20290917 is an apocalyptic number.

It is an amenable number.

20290917 is a deficient number, since it is larger than the sum of its proper divisors (8422043).

20290917 is a wasteful number, since it uses less digits than its factorization.

20290917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20290917 is about 4504.5440390788. The cubic root of 20290917 is about 272.7515484351.

It can be divided in two parts, 202 and 90917, that added together give a palindrome (91119).

The spelling of 20290917 in words is "twenty million, two hundred ninety thousand, nine hundred seventeen".