20311011231100 has 72 divisors (see below), whose sum is σ = 44521387198848. Its totient is φ = 8042138208000.

The previous prime is 20311011231089. The next prime is 20311011231101. The reversal of 20311011231100 is 113211011302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311011231101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44688594 + ... + 45140806.

It is an arithmetic number, because the mean of its divisors is an integer number (618352599984).

Almost surely, 2^{20311011231100} is an apocalyptic number.

20311011231100 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 20311011231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22260693599424).

20311011231100 is an abundant number, since it is smaller than the sum of its proper divisors (24210375967748).

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

20311011231100 is a wasteful number, since it uses less digits than its factorization.

20311011231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456775 (or 456768 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20311011231100 its reverse (113211011302), we get a palindrome (20424222242402).

The spelling of 20311011231100 in words is "twenty trillion, three hundred eleven billion, eleven million, two hundred thirty-one thousand, one hundred".