20692517 has 2 divisors, whose sum is σ = 20692518. Its totient is φ = 20692516.

The previous prime is 20692499. The next prime is 20692523. The reversal of 20692517 is 71529602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 343396 = 4511^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 20692517 - 2⁸ = 20692261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20692547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10346258 + 10346259.

It is an arithmetic number, because the mean of its divisors is an integer number (10346259).

Almost surely, 2^20692517 is an apocalyptic number.

It is an amenable number.

20692517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20692517 is an equidigital number, since it uses as much as digits as its factorization.

20692517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20692517 is about 4548.9028347504. The cubic root of 20692517 is about 274.5392482944.

The spelling of 20692517 in words is "twenty million, six hundred ninety-two thousand, five hundred seventeen".