20970797 has 2 divisors, whose sum is σ = 20970798. Its totient is φ = 20970796.

The previous prime is 20970769. The next prime is 20970811. The reversal of 20970797 is 79707902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13097161 + 7873636 = 3619^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 20970797 - 2¹⁴ = 20954413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20972797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485398 + 10485399.

It is an arithmetic number, because the mean of its divisors is an integer number (10485399).

Almost surely, 2^20970797 is an apocalyptic number.

It is an amenable number.

20970797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970797 is an equidigital number, since it uses as much as digits as its factorization.

20970797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55566, while the sum is 41.

The square root of 20970797 is about 4579.3882779253. The cubic root of 20970797 is about 275.7644712278.

The spelling of 20970797 in words is "twenty million, nine hundred seventy thousand, seven hundred ninety-seven".