20113131100420 has 12 divisors (see below), whose sum is σ = 42237575310924. Its totient is φ = 8045252440160.

The previous prime is 20113131100417. The next prime is 20113131100423. The reversal of 20113131100420 is 2400113131102.

It is an interprime number because it is at equal distance from previous prime (20113131100417) and next prime (20113131100423).

It can be written as a sum of positive squares in 2 ways, for example, as 6179917571136 + 13933213529284 = 2485944^2 + 3732722^2 .

It is not an unprimeable number, because it can be changed into a prime (20113131100423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502828277491 + ... + 502828277530.

It is an arithmetic number, because the mean of its divisors is an integer number (3519797942577).

Almost surely, 2^{20113131100420} is an apocalyptic number.

20113131100420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113131100420 is an abundant number, since it is smaller than the sum of its proper divisors (22124444210504).

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

20113131100420 is a wasteful number, since it uses less digits than its factorization.

20113131100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005656555030 (or 1005656555028 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20113131100420 its reverse (2400113131102), we get a palindrome (22513244231522).

The spelling of 20113131100420 in words is "twenty trillion, one hundred thirteen billion, one hundred thirty-one million, one hundred thousand, four hundred twenty".