20123545240 has 64 divisors (see below), whose sum is σ = 47831148000. Its totient is φ = 7598545920.

The previous prime is 20123545217. The next prime is 20123545271. The reversal of 20123545240 is 4254532102.

It is a junction number, because it is equal to n+sod(n) for n = 20123545199 and 20123545208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166446 + ... + 260674.

Almost surely, 2^20123545240 is an apocalyptic number.

20123545240 is a gapful number since it is divisible by the number (20) 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 20123545240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23915574000).

20123545240 is an abundant number, since it is smaller than the sum of its proper divisors (27707602760).

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

20123545240 is a wasteful number, since it uses less digits than its factorization.

20123545240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94540 (or 94536 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The spelling of 20123545240 in words is "twenty billion, one hundred twenty-three million, five hundred forty-five thousand, two hundred forty".