20624342617 has 2 divisors, whose sum is σ = 20624342618. Its totient is φ = 20624342616.

The previous prime is 20624342587. The next prime is 20624342653. The reversal of 20624342617 is 71624342602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18004540761 + 2619801856 = 134181^2 + 51184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20624342617 is a prime.

It is not a weakly prime, because it can be changed into another prime (20624342117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312171308 + 10312171309.

It is an arithmetic number, because the mean of its divisors is an integer number (10312171309).

Almost surely, 2^20624342617 is an apocalyptic number.

It is an amenable number.

20624342617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624342617 is an equidigital number, since it uses as much as digits as its factorization.

20624342617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 20624342617 in words is "twenty billion, six hundred twenty-four million, three hundred forty-two thousand, six hundred seventeen".