20268181660 has 48 divisors (see below), whose sum is σ = 45153793440. Its totient is φ = 7615662080.

The previous prime is 20268181649. The next prime is 20268181667. The reversal of 20268181660 is 6618186202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20268181667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119931 + ... + 234349.

It is an arithmetic number, because the mean of its divisors is an integer number (940704030).

Almost surely, 2^20268181660 is an apocalyptic number.

20268181660 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 20268181660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22576896720).

20268181660 is an abundant number, since it is smaller than the sum of its proper divisors (24885611780).

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

20268181660 is a wasteful number, since it uses less digits than its factorization.

20268181660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114966 (or 114964 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 20268181660 in words is "twenty billion, two hundred sixty-eight million, one hundred eighty-one thousand, six hundred sixty".