20226402868 has 72 divisors (see below), whose sum is σ = 43786039752. Its totient is φ = 8123222016.

The previous prime is 20226402853. The next prime is 20226402871. The reversal of 20226402868 is 86820462202.

It can be written as a sum of positive squares in 4 ways, for example, as 5858065444 + 14368337424 = 76538^2 + 119868^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20226402868.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 763330 + ... + 789382.

It is an arithmetic number, because the mean of its divisors is an integer number (608139441).

Almost surely, 2^20226402868 is an apocalyptic number.

20226402868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20226402868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21893019876).

20226402868 is an abundant number, since it is smaller than the sum of its proper divisors (23559636884).

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

20226402868 is a wasteful number, since it uses less digits than its factorization.

20226402868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26321 (or 26312 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 20226402868 in words is "twenty billion, two hundred twenty-six million, four hundred two thousand, eight hundred sixty-eight".