20868242869 has 2 divisors, whose sum is σ = 20868242870. Its totient is φ = 20868242868.

The previous prime is 20868242833. The next prime is 20868242903. The reversal of 20868242869 is 96824286802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20753859844 + 114383025 = 144062^2 + 10695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868242869 - 2¹¹ = 20868240821 is a prime.

It is a super-3 number, since 3×20868242869³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20868242809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434121434 + 10434121435.

It is an arithmetic number, because the mean of its divisors is an integer number (10434121435).

Almost surely, 2^20868242869 is an apocalyptic number.

It is an amenable number.

20868242869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868242869 is an equidigital number, since it uses as much as digits as its factorization.

20868242869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5308416, while the sum is 55.

The spelling of 20868242869 in words is "twenty billion, eight hundred sixty-eight million, two hundred forty-two thousand, eight hundred sixty-nine".