20986763 has 4 divisors (see below), whose sum is σ = 23984880. Its totient is φ = 17988648.

The previous prime is 20986747. The next prime is 20986817. The reversal of 20986763 is 36768902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36768902 = 2 ⋅18384451.

It is a cyclic number.

It is not a de Polignac number, because 20986763 - 2⁴ = 20986747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20986763.

It is not an unprimeable number, because it can be changed into a prime (20986703) 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 3 ways as a sum of consecutive naturals, for example, 1499048 + ... + 1499061.

It is an arithmetic number, because the mean of its divisors is an integer number (5996220).

Almost surely, 2^20986763 is an apocalyptic number.

20986763 is a deficient number, since it is larger than the sum of its proper divisors (2998117).

20986763 is an equidigital number, since it uses as much as digits as its factorization.

20986763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2998116.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 20986763 is about 4581.1311921839. The cubic root of 20986763 is about 275.8344373917.

The spelling of 20986763 in words is "twenty million, nine hundred eighty-six thousand, seven hundred sixty-three".