20217057739 has 2 divisors, whose sum is σ = 20217057740. Its totient is φ = 20217057738.

The previous prime is 20217057703. The next prime is 20217057761. The reversal of 20217057739 is 93775071202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20217057739 - 2¹⁹ = 20216533451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20217057695 and 20217057704.

It is not a weakly prime, because it can be changed into another prime (20217057439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108528869 + 10108528870.

It is an arithmetic number, because the mean of its divisors is an integer number (10108528870).

Almost surely, 2^20217057739 is an apocalyptic number.

20217057739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217057739 is an equidigital number, since it uses as much as digits as its factorization.

20217057739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 43.

The spelling of 20217057739 in words is "twenty billion, two hundred seventeen million, fifty-seven thousand, seven hundred thirty-nine".