20484447387 has 16 divisors (see below), whose sum is σ = 27455984160. Its totient is φ = 13584729600.

The previous prime is 20484447377. The next prime is 20484447391. The reversal of 20484447387 is 78374448402.

It is not a de Polignac number, because 20484447387 - 2¹¹ = 20484445339 is a prime.

It is a super-2 number, since 2×20484447387² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20484447367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665289 + ... + 695397.

It is an arithmetic number, because the mean of its divisors is an integer number (1715999010).

Almost surely, 2^20484447387 is an apocalyptic number.

20484447387 is a deficient number, since it is larger than the sum of its proper divisors (6971536773).

20484447387 is a wasteful number, since it uses less digits than its factorization.

20484447387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31294.

The product of its (nonzero) digits is 4816896, while the sum is 51.

The spelling of 20484447387 in words is "twenty billion, four hundred eighty-four million, four hundred forty-seven thousand, three hundred eighty-seven".