20123311101200 has 60 divisors (see below), whose sum is σ = 48349489641828. Its totient is φ = 8048785881600.

The previous prime is 20123311101197. The next prime is 20123311101227. The reversal of 20123311101200 is 210111332102.

It can be written as a sum of positive squares in 6 ways, for example, as 2198553493504 + 17924757607696 = 1482752^2 + 4233764^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4329710 + ... + 7680690.

Almost surely, 2^{20123311101200} is an apocalyptic number.

20123311101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123311101200 is an abundant number, since it is smaller than the sum of its proper divisors (28226178540628).

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

20123311101200 is a wasteful number, since it uses less digits than its factorization.

20123311101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366012 (or 3366001 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20123311101200 its reverse (210111332102), we get a palindrome (20333422433302).

The spelling of 20123311101200 in words is "twenty trillion, one hundred twenty-three billion, three hundred eleven million, one hundred one thousand, two hundred".