20496517 has 2 divisors, whose sum is σ = 20496518. Its totient is φ = 20496516.

The previous prime is 20496499. The next prime is 20496551. The reversal of 20496517 is 71569402.

It is an a-pointer prime, because the next prime (20496551) can be obtained adding 20496517 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 1083681 = 4406^2 + 1041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20496517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20496587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248258 + 10248259.

It is an arithmetic number, because the mean of its divisors is an integer number (10248259).

Almost surely, 2^20496517 is an apocalyptic number.

It is an amenable number.

20496517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20496517 is an equidigital number, since it uses as much as digits as its factorization.

20496517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20496517 is about 4527.3079197245. The cubic root of 20496517 is about 273.6696829353.

It can be divided in two parts, 204 and 96517, that added together give a square (96721 = 311²).

The spelling of 20496517 in words is "twenty million, four hundred ninety-six thousand, five hundred seventeen".