123431431111020 has 144 divisors (see below), whose sum is σ = 376477787911680. Its totient is φ = 32733247910400.

The previous prime is 123431431110989. The next prime is 123431431111031. The reversal of 123431431111020 is 20111134134321.

123431431111020 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 314 + 311 + 1 + 10 + 20 = 666.

It is a super-2 number, since 2×123431431111020² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118746750 + ... + 119781690.

It is an arithmetic number, because the mean of its divisors is an integer number (2614429082720).

Almost surely, 2^{123431431111020} is an apocalyptic number.

123431431111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123431431111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188238893955840).

123431431111020 is an abundant number, since it is smaller than the sum of its proper divisors (253046356800660).

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

123431431111020 is a wasteful number, since it uses less digits than its factorization.

123431431111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038616 (or 1038611 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 123431431111020 its reverse (20111134134321), we get a palindrome (143542565245341).

The spelling of 123431431111020 in words is "one hundred twenty-three trillion, four hundred thirty-one billion, four hundred thirty-one million, one hundred eleven thousand, twenty".