20017061579 has 6 divisors (see below), whose sum is σ = 20295029556. Its totient is φ = 19742850000.

The previous prime is 20017061549. The next prime is 20017061591. The reversal of 20017061579 is 97516071002.

It is a de Polignac number, because none of the positive numbers 2^k-20017061579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20017061539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1872797 + ... + 1883454.

It is an arithmetic number, because the mean of its divisors is an integer number (3382504926).

Almost surely, 2^20017061579 is an apocalyptic number.

20017061579 is a deficient number, since it is larger than the sum of its proper divisors (277967977).

20017061579 is an frugal number, since it uses more digits than its factorization.

20017061579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756397 (or 3756324 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 20017061579 in words is "twenty billion, seventeen million, sixty-one thousand, five hundred seventy-nine".