100018201820 has 24 divisors (see below), whose sum is σ = 210199474464. Its totient is φ = 39976566336.

The previous prime is 100018201763. The next prime is 100018201823. The reversal of 100018201820 is 28102810001.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100018201823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1892939 + ... + 1945058.

It is an arithmetic number, because the mean of its divisors is an integer number (8758311436).

Almost surely, 2^100018201820 is an apocalyptic number.

100018201820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100018201820 is an abundant number, since it is smaller than the sum of its proper divisors (110181272644).

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

100018201820 is a wasteful number, since it uses less digits than its factorization.

100018201820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839309 (or 3839307 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 100018201820 in words is "one hundred billion, eighteen million, two hundred one thousand, eight hundred twenty".