20970617 has 2 divisors, whose sum is σ = 20970618. Its totient is φ = 20970616.

The previous prime is 20970589. The next prime is 20970643. The reversal of 20970617 is 71607902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14600041 + 6370576 = 3821^2 + 2524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20970617 - 2⁶ = 20970553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20970667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10485308 + 10485309.

It is an arithmetic number, because the mean of its divisors is an integer number (10485309).

Almost surely, 2^20970617 is an apocalyptic number.

It is an amenable number.

20970617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970617 is an equidigital number, since it uses as much as digits as its factorization.

20970617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 20970617 is about 4579.3686246032. The cubic root of 20970617 is about 275.7636822299.

The spelling of 20970617 in words is "twenty million, nine hundred seventy thousand, six hundred seventeen".