20100203122020 has 144 divisors (see below), whose sum is σ = 65500237289088. Its totient is φ = 4592156405760.

The previous prime is 20100203122003. The next prime is 20100203122049. The reversal of 20100203122020 is 2022130200102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4594425 + ... + 7830015.

It is an arithmetic number, because the mean of its divisors is an integer number (454862758952).

Almost surely, 2^{20100203122020} is an apocalyptic number.

20100203122020 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 20100203122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32750118644544).

20100203122020 is an abundant number, since it is smaller than the sum of its proper divisors (45400034167068).

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

20100203122020 is a wasteful number, since it uses less digits than its factorization.

20100203122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3237730 (or 3237721 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20100203122020 its reverse (2022130200102), we get a palindrome (22122333322122).

The spelling of 20100203122020 in words is "twenty trillion, one hundred billion, two hundred three million, one hundred twenty-two thousand, twenty".