20123000520 has 128 divisors (see below), whose sum is σ = 70401312000. Its totient is φ = 4599533568.

The previous prime is 20123000507. The next prime is 20123000561. The reversal of 20123000520 is 2500032102.

It is a super-3 number, since 3×20123000520³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20123000520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203289 + ... + 285608.

It is an arithmetic number, because the mean of its divisors is an integer number (550010250).

Almost surely, 2^20123000520 is an apocalyptic number.

20123000520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123000520 is an abundant number, since it is smaller than the sum of its proper divisors (50278311480).

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

20123000520 is a wasteful number, since it uses less digits than its factorization.

20123000520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488932 (or 488914 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 20123000520 its reverse (2500032102), we get a palindrome (22623032622).

The spelling of 20123000520 in words is "twenty billion, one hundred twenty-three million, five hundred twenty", and thus it is an aban number.