20868242879 has 8 divisors (see below), whose sum is σ = 23039638272. Its totient is φ = 18742561240.

The previous prime is 20868242869. The next prime is 20868242903. The reversal of 20868242879 is 97824286802.

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 20868242879 - 2⁸ = 20868242623 is a prime.

It is a super-3 number, since 3×20868242879³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868242809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11427479 + ... + 11429304.

It is an arithmetic number, because the mean of its divisors is an integer number (2879954784).

Almost surely, 2^20868242879 is an apocalyptic number.

20868242879 is a deficient number, since it is larger than the sum of its proper divisors (2171395393).

20868242879 is a wasteful number, since it uses less digits than its factorization.

20868242879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22856877.

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 20868242879 in words is "twenty billion, eight hundred sixty-eight million, two hundred forty-two thousand, eight hundred seventy-nine".