20131223203020 has 24 divisors (see below), whose sum is σ = 56367424968624. Its totient is φ = 5368326187456.

The previous prime is 20131223203019. The next prime is 20131223203051. The reversal of 20131223203020 is 2030232213102.

It is a happy number.

It is a super-2 number, since 2×20131223203020² (a number of 27 digits) contains 22 as substring.

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, 167760193299 + ... + 167760193418.

It is an arithmetic number, because the mean of its divisors is an integer number (2348642707026).

Almost surely, 2^{20131223203020} is an apocalyptic number.

20131223203020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131223203020 is an abundant number, since it is smaller than the sum of its proper divisors (36236201765604).

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

20131223203020 is a wasteful number, since it uses less digits than its factorization.

20131223203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335520386729 (or 335520386727 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20131223203020 its reverse (2030232213102), we get a palindrome (22161455416122).

The spelling of 20131223203020 in words is "twenty trillion, one hundred thirty-one billion, two hundred twenty-three million, two hundred three thousand, twenty".