20858614717 has 2 divisors, whose sum is σ = 20858614718. Its totient is φ = 20858614716.

The previous prime is 20858614681. The next prime is 20858614727. The reversal of 20858614717 is 71741685802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16238150041 + 4620464676 = 127429^2 + 67974^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858614717 - 2⁷ = 20858614589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20858614727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429307358 + 10429307359.

It is an arithmetic number, because the mean of its divisors is an integer number (10429307359).

Almost surely, 2^20858614717 is an apocalyptic number.

It is an amenable number.

20858614717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858614717 is an equidigital number, since it uses as much as digits as its factorization.

20858614717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 20858614717 in words is "twenty billion, eight hundred fifty-eight million, six hundred fourteen thousand, seven hundred seventeen".