20764223 has 2 divisors, whose sum is σ = 20764224. Its totient is φ = 20764222.

The previous prime is 20764213. The next prime is 20764229. The reversal of 20764223 is 32246702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20764223 - 2¹⁰ = 20763199 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20764192 and 20764201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20764229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382111 + 10382112.

It is an arithmetic number, because the mean of its divisors is an integer number (10382112).

Almost surely, 2^20764223 is an apocalyptic number.

20764223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764223 is an equidigital number, since it uses as much as digits as its factorization.

20764223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20764223 is about 4556.7776992081. Note that the first 3 decimals coincide. The cubic root of 20764223 is about 274.8560039525.

The spelling of 20764223 in words is "twenty million, seven hundred sixty-four thousand, two hundred twenty-three".