20003705280 has 504 divisors, whose sum is σ = 75658937328. Its totient is φ = 4847910912.

The previous prime is 20003705273. The next prime is 20003705317. The reversal of 20003705280 is 8250730002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 35530279 + ... + 35530841.

Almost surely, 2^20003705280 is an apocalyptic number.

20003705280 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 20003705280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37829468664).

20003705280 is an abundant number, since it is smaller than the sum of its proper divisors (55655232048).

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

20003705280 is a wasteful number, since it uses less digits than its factorization.

20003705280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The spelling of 20003705280 in words is "twenty billion, three million, seven hundred five thousand, two hundred eighty".