20111020210220 has 48 divisors (see below), whose sum is σ = 42671488583808. Its totient is φ = 7960925061120.

The previous prime is 20111020210217. The next prime is 20111020210223. The reversal of 20111020210220 is 2201202011102.

It is an interprime number because it is at equal distance from previous prime (20111020210217) and next prime (20111020210223).

It is a junction number, because it is equal to n+sod(n) for n = 20111020210195 and 20111020210204.

It is not an unprimeable number, because it can be changed into a prime (20111020210223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28269485 + ... + 28972155.

It is an arithmetic number, because the mean of its divisors is an integer number (888989345496).

Almost surely, 2^{20111020210220} is an apocalyptic number.

20111020210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111020210220 is an abundant number, since it is smaller than the sum of its proper divisors (22560468373588).

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

20111020210220 is a wasteful number, since it uses less digits than its factorization.

20111020210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717530 (or 717528 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20111020210220 its reverse (2201202011102), we get a palindrome (22312222221322).

The spelling of 20111020210220 in words is "twenty trillion, one hundred eleven billion, twenty million, two hundred ten thousand, two hundred twenty".