20492917 has 4 divisors (see below), whose sum is σ = 20502720. Its totient is φ = 20483116.

The previous prime is 20492911. The next prime is 20492921. The reversal of 20492917 is 71929402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20492917 - 2⁷ = 20492789 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 (20492911) 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, 367 + ... + 6412.

It is an arithmetic number, because the mean of its divisors is an integer number (5125680).

Almost surely, 2^20492917 is an apocalyptic number.

It is an amenable number.

20492917 is a deficient number, since it is larger than the sum of its proper divisors (9803).

20492917 is an equidigital number, since it uses as much as digits as its factorization.

20492917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20492917 is about 4526.9103149941. The cubic root of 20492917 is about 273.6536595861.

The spelling of 20492917 in words is "twenty million, four hundred ninety-two thousand, nine hundred seventeen".