20873863 has 4 divisors (see below), whose sum is σ = 20926840. Its totient is φ = 20820888.

The previous prime is 20873861. The next prime is 20873869. The reversal of 20873863 is 36837802.

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

It is a cyclic number.

It is not a de Polignac number, because 20873863 - 2¹ = 20873861 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 (20873861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25893 + ... + 26686.

It is an arithmetic number, because the mean of its divisors is an integer number (5231710).

Almost surely, 2^20873863 is an apocalyptic number.

20873863 is a deficient number, since it is larger than the sum of its proper divisors (52977).

20873863 is an equidigital number, since it uses as much as digits as its factorization.

20873863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52976.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20873863 is about 4568.7922911859. The cubic root of 20873863 is about 275.3389231701.

It can be divided in two parts, 20873 and 863, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 20873863 in words is "twenty million, eight hundred seventy-three thousand, eight hundred sixty-three".