20123357072 has 80 divisors (see below), whose sum is σ = 48022343040. Its totient is φ = 7954937856.

The previous prime is 20123357069. The next prime is 20123357123. The reversal of 20123357072 is 27075332102.

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, 2294648 + ... + 2303400.

It is an arithmetic number, because the mean of its divisors is an integer number (600279288).

Almost surely, 2^20123357072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20123357072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24011171520).

20123357072 is an abundant number, since it is smaller than the sum of its proper divisors (27898985968).

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

20123357072 is a wasteful number, since it uses less digits than its factorization.

20123357072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10360 (or 10354 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

Adding to 20123357072 its reverse (27075332102), we get a palindrome (47198689174).

The spelling of 20123357072 in words is "twenty billion, one hundred twenty-three million, three hundred fifty-seven thousand, seventy-two".