20101100120020 has 24 divisors (see below), whose sum is σ = 42238976338944. Its totient is φ = 8035360793376.

The previous prime is 20101100119937. The next prime is 20101100120039. The reversal of 20101100120020 is 2002100110102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20101100119979 and 20101100120006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317420964 + ... + 317484283.

It is an arithmetic number, because the mean of its divisors is an integer number (1759957347456).

Almost surely, 2^{20101100120020} is an apocalyptic number.

20101100120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101100120020 is an abundant number, since it is smaller than the sum of its proper divisors (22137876218924).

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

20101100120020 is a wasteful number, since it uses less digits than its factorization.

20101100120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634906839 (or 634906837 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20101100120020 its reverse (2002100110102), we get a palindrome (22103200230122).

The spelling of 20101100120020 in words is "twenty trillion, one hundred one billion, one hundred million, one hundred twenty thousand, twenty".