20862566868 has 288 divisors, whose sum is σ = 60240854016. Its totient is φ = 5575680000.

The previous prime is 20862566863. The next prime is 20862566897. The reversal of 20862566868 is 86866526802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20862566863) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59100580 + ... + 59100932.

It is an arithmetic number, because the mean of its divisors is an integer number (209169632).

Almost surely, 2^20862566868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20862566868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30120427008).

20862566868 is an abundant number, since it is smaller than the sum of its proper divisors (39378287148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20862566868 is a wasteful number, since it uses less digits than its factorization.

20862566868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 20862566868 in words is "twenty billion, eight hundred sixty-two million, five hundred sixty-six thousand, eight hundred sixty-eight".