20311003100 has 72 divisors (see below), whose sum is σ = 44793726768. Its totient is φ = 7992230400.

The previous prime is 20311003067. The next prime is 20311003127. The reversal of 20311003100 is 130011302.

It is a super-2 number, since 2×20311003100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6383510 + ... + 6386690.

It is an arithmetic number, because the mean of its divisors is an integer number (622135094).

Almost surely, 2^20311003100 is an apocalyptic number.

20311003100 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 20311003100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22396863384).

20311003100 is an abundant number, since it is smaller than the sum of its proper divisors (24482723668).

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

20311003100 is a wasteful number, since it uses less digits than its factorization.

20311003100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4215 (or 4208 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 20311003100 its reverse (130011302), we get a palindrome (20441014402).

The spelling of 20311003100 in words is "twenty billion, three hundred eleven million, three thousand, one hundred".