20764213 has 2 divisors, whose sum is σ = 20764214. Its totient is φ = 20764212.

The previous prime is 20764189. The next prime is 20764223. The reversal of 20764213 is 31246702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20277009 + 487204 = 4503^2 + 698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20764213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20764223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382106 + 10382107.

It is an arithmetic number, because the mean of its divisors is an integer number (10382107).

Almost surely, 2^20764213 is an apocalyptic number.

It is an amenable number.

20764213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764213 is an equidigital number, since it uses as much as digits as its factorization.

20764213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20764213 is about 4556.7766019413. The cubic root of 20764213 is about 274.8559598292.

The spelling of 20764213 in words is "twenty million, seven hundred sixty-four thousand, two hundred thirteen".