20219696579 has 4 divisors (see below), whose sum is σ = 20220910680. Its totient is φ = 20218482480.

The previous prime is 20219696557. The next prime is 20219696591. The reversal of 20219696579 is 97569691202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97569691202 = 2 ⋅48784845601.

It is a cyclic number.

It is not a de Polignac number, because 20219696579 - 2²⁰ = 20218648003 is a prime.

It is a super-2 number, since 2×20219696579² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20219606579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581717 + ... + 615494.

It is an arithmetic number, because the mean of its divisors is an integer number (5055227670).

Almost surely, 2^20219696579 is an apocalyptic number.

20219696579 is a deficient number, since it is larger than the sum of its proper divisors (1214101).

20219696579 is a wasteful number, since it uses less digits than its factorization.

20219696579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214100.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 20219696579 in words is "twenty billion, two hundred nineteen million, six hundred ninety-six thousand, five hundred seventy-nine".