20497863 has 4 divisors (see below), whose sum is σ = 27330488. Its totient is φ = 13665240.

The previous prime is 20497859. The next prime is 20497877. The reversal of 20497863 is 36879402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20497863 - 2² = 20497859 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 (20497843) 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, 3416308 + ... + 3416313.

It is an arithmetic number, because the mean of its divisors is an integer number (6832622).

Almost surely, 2^20497863 is an apocalyptic number.

20497863 is a deficient number, since it is larger than the sum of its proper divisors (6832625).

20497863 is an equidigital number, since it uses as much as digits as its factorization.

20497863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6832624.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20497863 is about 4527.4565707470. The cubic root of 20497863 is about 273.6756734056.

The spelling of 20497863 in words is "twenty million, four hundred ninety-seven thousand, eight hundred sixty-three".