20123111544 has 32 divisors (see below), whose sum is σ = 50338129920. Its totient is φ = 6703657056.

The previous prime is 20123111543. The next prime is 20123111551. The reversal of 20123111544 is 44511132102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123111543) 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, 212182 + ... + 292005.

It is an arithmetic number, because the mean of its divisors is an integer number (1573066560).

Almost surely, 2^20123111544 is an apocalyptic number.

20123111544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20123111544 is an abundant number, since it is smaller than the sum of its proper divisors (30215018376).

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

20123111544 is a wasteful number, since it uses less digits than its factorization.

20123111544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505859 (or 505855 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 20123111544 its reverse (44511132102), we get a palindrome (64634243646).

The spelling of 20123111544 in words is "twenty billion, one hundred twenty-three million, one hundred eleven thousand, five hundred forty-four".