20003121992 has 32 divisors (see below), whose sum is σ = 42876462720. Its totient is φ = 8570240640.

The previous prime is 20003121991. The next prime is 20003122021. The reversal of 20003121992 is 29912130002.

It is not an unprimeable number, because it can be changed into a prime (20003121991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145748 + ... + 247484.

It is an arithmetic number, because the mean of its divisors is an integer number (1339889460).

Almost surely, 2^20003121992 is an apocalyptic number.

It is an amenable number.

20003121992 is an abundant number, since it is smaller than the sum of its proper divisors (22873340728).

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

20003121992 is a wasteful number, since it uses less digits than its factorization.

20003121992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105261 (or 105257 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

Adding to 20003121992 its reverse (29912130002), we get a palindrome (49915251994).

The spelling of 20003121992 in words is "twenty billion, three million, one hundred twenty-one thousand, nine hundred ninety-two".