20679223 has 2 divisors, whose sum is σ = 20679224. Its totient is φ = 20679222.

The previous prime is 20679199. The next prime is 20679229. The reversal of 20679223 is 32297602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20679223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20679229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339611 + 10339612.

It is an arithmetic number, because the mean of its divisors is an integer number (10339612).

Almost surely, 2^20679223 is an apocalyptic number.

20679223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679223 is an equidigital number, since it uses as much as digits as its factorization.

20679223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20679223 is about 4547.4413685060. The cubic root of 20679223 is about 274.4804427104.

It can be divided in two parts, 20679 and 223, that added together give a palindrome (20902).

The spelling of 20679223 in words is "twenty million, six hundred seventy-nine thousand, two hundred twenty-three".