20781292579 has 8 divisors (see below), whose sum is σ = 22034719440. Its totient is φ = 19543833216.

The previous prime is 20781292559. The next prime is 20781292627. The reversal of 20781292579 is 97529218702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20781292579 - 2¹³ = 20781284387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20781292559) 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 7 ways as a sum of consecutive naturals, for example, 3989194 + ... + 3994399.

It is an arithmetic number, because the mean of its divisors is an integer number (2754339930).

Almost surely, 2^20781292579 is an apocalyptic number.

20781292579 is a deficient number, since it is larger than the sum of its proper divisors (1253426861).

20781292579 is a wasteful number, since it uses less digits than its factorization.

20781292579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7983749.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 20781292579 in words is "twenty billion, seven hundred eighty-one million, two hundred ninety-two thousand, five hundred seventy-nine".