20123232140 has 96 divisors (see below), whose sum is σ = 47795650560. Its totient is φ = 7052787200.

The previous prime is 20123232137. The next prime is 20123232167. The reversal of 20123232140 is 4123232102.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 31 ways as a sum of consecutive naturals, for example, 735221 + ... + 762099.

It is an arithmetic number, because the mean of its divisors is an integer number (497871360).

Almost surely, 2^20123232140 is an apocalyptic number.

20123232140 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 20123232140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23897825280).

20123232140 is an abundant number, since it is smaller than the sum of its proper divisors (27672418420).

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

20123232140 is a wasteful number, since it uses less digits than its factorization.

20123232140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27023 (or 27021 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20123232140 its reverse (4123232102), we get a palindrome (24246464242).

The spelling of 20123232140 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred forty".