20321266860 has 288 divisors, whose sum is σ = 65789418240. Its totient is φ = 5068578816.

The previous prime is 20321266807. The next prime is 20321266879. The reversal of 20321266860 is 6866212302.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27723054 + ... + 27723786.

It is an arithmetic number, because the mean of its divisors is an integer number (228435480).

Almost surely, 2^20321266860 is an apocalyptic number.

20321266860 is a gapful number since it is divisible by the number (20) 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 20321266860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32894709120).

20321266860 is an abundant number, since it is smaller than the sum of its proper divisors (45468151380).

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

20321266860 is a wasteful number, since it uses less digits than its factorization.

20321266860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

It can be divided in two parts, 203212 and 66860, that added together give a palindrome (270072).

The spelling of 20321266860 in words is "twenty billion, three hundred twenty-one million, two hundred sixty-six thousand, eight hundred sixty".