20031012100 has 36 divisors (see below), whose sum is σ = 47418871248. Its totient is φ = 7284004000.

The previous prime is 20031012073. The next prime is 20031012103. The reversal of 20031012100 is 121013002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20031012103) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9103906 + ... + 9106105.

It is an arithmetic number, because the mean of its divisors is an integer number (1317190868).

Almost surely, 2^20031012100 is an apocalyptic number.

20031012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20031012100 is an abundant number, since it is smaller than the sum of its proper divisors (27387859148).

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

20031012100 is a wasteful number, since it uses less digits than its factorization.

20031012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18210036 (or 18210029 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20031012100 its reverse (121013002), we get a palindrome (20152025102).

The spelling of 20031012100 in words is "twenty billion, thirty-one million, twelve thousand, one hundred".