20123231022 has 72 divisors (see below), whose sum is σ = 45448619736. Its totient is φ = 6434430912.

The previous prime is 20123231017. The next prime is 20123231069. The reversal of 20123231022 is 22013232102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20123230986 and 20123231004.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 2372433 + ... + 2380899.

Almost surely, 2^20123231022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20123231022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22724309868).

20123231022 is an abundant number, since it is smaller than the sum of its proper divisors (25325388714).

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

20123231022 is a wasteful number, since it uses less digits than its factorization.

20123231022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690 (or 8658 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20123231022 its reverse (22013232102), we get a palindrome (42136463124).

The spelling of 20123231022 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-one thousand, twenty-two".