20497163 has 6 divisors (see below), whose sum is σ = 21427644. Its totient is φ = 19605476.

The previous prime is 20497157. The next prime is 20497201. The reversal of 20497163 is 36179402.

It is not a de Polignac number, because 20497163 - 2¹⁰ = 20496139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20497063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18845 + ... + 19902.

It is an arithmetic number, because the mean of its divisors is an integer number (3571274).

Almost surely, 2^20497163 is an apocalyptic number.

20497163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20497163 is a deficient number, since it is larger than the sum of its proper divisors (930481).

20497163 is an equidigital number, since it uses as much as digits as its factorization.

20497163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38793 (or 38770 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20497163 is about 4527.3792639893. The cubic root of 20497163 is about 273.6725580377.

The spelling of 20497163 in words is "twenty million, four hundred ninety-seven thousand, one hundred sixty-three".