20123235240 has 64 divisors (see below), whose sum is σ = 63920871360. Its totient is φ = 5050536960.

The previous prime is 20123235221. The next prime is 20123235289. The reversal of 20123235240 is 4253232102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20123235240.

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 15 ways as a sum of consecutive naturals, for example, 4930126 + ... + 4934205.

It is an arithmetic number, because the mean of its divisors is an integer number (998763615).

Almost surely, 2^20123235240 is an apocalyptic number.

20123235240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123235240 is an abundant number, since it is smaller than the sum of its proper divisors (43797636120).

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

20123235240 is a wasteful number, since it uses less digits than its factorization.

20123235240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864362 (or 9864358 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 20123235240 its reverse (4253232102), we get a palindrome (24376467342).

The spelling of 20123235240 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-five thousand, two hundred forty".