20101231233220 has 24 divisors (see below), whose sum is σ = 44695678860504. Its totient is φ = 7567522346496.

The previous prime is 20101231233151. The next prime is 20101231233221. The reversal of 20101231233220 is 2233213210102.

It can be written as a sum of positive squares in 4 ways, for example, as 7092282701956 + 13008948531264 = 2663134^2 + 3606792^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20101231233191 and 20101231233200.

It is not an unprimeable number, because it can be changed into a prime (20101231233221) 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, 29560633827 + ... + 29560634506.

It is an arithmetic number, because the mean of its divisors is an integer number (1862319952521).

Almost surely, 2^{20101231233220} is an apocalyptic number.

20101231233220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101231233220 is an abundant number, since it is smaller than the sum of its proper divisors (24594447627284).

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

20101231233220 is a wasteful number, since it uses less digits than its factorization.

20101231233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59121268359 (or 59121268357 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20101231233220 its reverse (2233213210102), we get a palindrome (22334444443322).

The spelling of 20101231233220 in words is "twenty trillion, one hundred one billion, two hundred thirty-one million, two hundred thirty-three thousand, two hundred twenty".