20623783 has 4 divisors (see below), whose sum is σ = 20635768. Its totient is φ = 20611800.

The previous prime is 20623777. The next prime is 20623807. The reversal of 20623783 is 38732602.

It is a semiprime because it is the product of two primes, 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 20623783 - 2⁵ = 20623751 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 (20623283) 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, 2868 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (5158942).

Almost surely, 2^20623783 is an apocalyptic number.

20623783 is a deficient number, since it is larger than the sum of its proper divisors (11985).

20623783 is an equidigital number, since it uses as much as digits as its factorization.

20623783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11984.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20623783 is about 4541.3415418794. The cubic root of 20623783 is about 274.2349335684.

The spelling of 20623783 in words is "twenty million, six hundred twenty-three thousand, seven hundred eighty-three".