20490717 has 16 divisors (see below), whose sum is σ = 29714048. Its totient is φ = 12484800.

The previous prime is 20490713. The next prime is 20490727. The reversal of 20490717 is 71709402.

It is not a de Polignac number, because 20490717 - 2² = 20490713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490713) 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, 1467 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1857128).

Almost surely, 2^20490717 is an apocalyptic number.

It is an amenable number.

20490717 is a deficient number, since it is larger than the sum of its proper divisors (9223331).

20490717 is a wasteful number, since it uses less digits than its factorization.

20490717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20490717 is about 4526.6673171330. The cubic root of 20490717 is about 273.6438666156.

The spelling of 20490717 in words is "twenty million, four hundred ninety thousand, seven hundred seventeen".