20792917 has 4 divisors (see below), whose sum is σ = 20802060. Its totient is φ = 20783776.

The previous prime is 20792899. The next prime is 20792939. The reversal of 20792917 is 71929702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7789681 + 13003236 = 2791^2 + 3606^2 .

It is a cyclic number.

It is not a de Polignac number, because 20792917 - 2⁷ = 20792789 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 (20792987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (5200515).

Almost surely, 2^20792917 is an apocalyptic number.

It is an amenable number.

20792917 is a deficient number, since it is larger than the sum of its proper divisors (9143).

20792917 is an equidigital number, since it uses as much as digits as its factorization.

20792917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9142.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 20792917 is about 4559.9251090341. The cubic root of 20792917 is about 274.9825531631.

The spelling of 20792917 in words is "twenty million, seven hundred ninety-two thousand, nine hundred seventeen".