20964197 has 2 divisors, whose sum is σ = 20964198. Its totient is φ = 20964196.

The previous prime is 20964169. The next prime is 20964221. The reversal of 20964197 is 79146902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 2076481 = 4346^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20964197 - 2¹⁸ = 20702053 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20964197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20964107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482098 + 10482099.

It is an arithmetic number, because the mean of its divisors is an integer number (10482099).

Almost surely, 2^20964197 is an apocalyptic number.

It is an amenable number.

20964197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20964197 is an equidigital number, since it uses as much as digits as its factorization.

20964197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20964197 is about 4578.6676009512. The cubic root of 20964197 is about 275.7355383507.

The spelling of 20964197 in words is "twenty million, nine hundred sixty-four thousand, one hundred ninety-seven".