23111120020 has 24 divisors (see below), whose sum is σ = 49328983368. Its totient is φ = 9092899200.

The previous prime is 23111119991. The next prime is 23111120023. The reversal of 23111120020 is 2002111132.

It can be written as a sum of positive squares in 4 ways, for example, as 2777500804 + 20333619216 = 52702^2 + 142596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111120023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9470551 + ... + 9472990.

It is an arithmetic number, because the mean of its divisors is an integer number (2055374307).

Almost surely, 2^23111120020 is an apocalyptic number.

23111120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23111120020 is an abundant number, since it is smaller than the sum of its proper divisors (26217863348).

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

23111120020 is a wasteful number, since it uses less digits than its factorization.

23111120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18943611 (or 18943609 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 23111120020 its reverse (2002111132), we get a palindrome (25113231152).

The spelling of 23111120020 in words is "twenty-three billion, one hundred eleven million, one hundred twenty thousand, twenty".