20601517 has 2 divisors, whose sum is σ = 20601518. Its totient is φ = 20601516.

The previous prime is 20601509. The next prime is 20601523. The reversal of 20601517 is 71510602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 1990921 = 4314^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20601517 - 2³ = 20601509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20601547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300758 + 10300759.

It is an arithmetic number, because the mean of its divisors is an integer number (10300759).

Almost surely, 2^20601517 is an apocalyptic number.

It is an amenable number.

20601517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601517 is an equidigital number, since it uses as much as digits as its factorization.

20601517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20601517 is about 4538.8894016048. The cubic root of 20601517 is about 274.1362075201.

The spelling of 20601517 in words is "twenty million, six hundred one thousand, five hundred seventeen".