123311022020 has 24 divisors (see below), whose sum is σ = 261328867800. Its totient is φ = 48871890432.

The previous prime is 123311022017. The next prime is 123311022031. The reversal of 123311022020 is 20220113321.

It can be written as a sum of positive squares in 4 ways, for example, as 637360516 + 122673661504 = 25246^2 + 350248^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123311022020.

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, 28280165 + ... + 28284524.

It is an arithmetic number, because the mean of its divisors is an integer number (10888702825).

Almost surely, 2^123311022020 is an apocalyptic number.

123311022020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123311022020 is an abundant number, since it is smaller than the sum of its proper divisors (138017845780).

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

123311022020 is a wasteful number, since it uses less digits than its factorization.

123311022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56564807 (or 56564805 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 123311022020 its reverse (20220113321), we get a palindrome (143531135341).

The spelling of 123311022020 in words is "one hundred twenty-three billion, three hundred eleven million, twenty-two thousand, twenty".