20181286372 has 24 divisors (see below), whose sum is σ = 38040473016. Its totient is φ = 9312845568.

The previous prime is 20181286339. The next prime is 20181286387. The reversal of 20181286372 is 27368218102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 157904356 + 20023382016 = 12566^2 + 141504^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306618 + ... + 366574.

It is an arithmetic number, because the mean of its divisors is an integer number (1585019709).

Almost surely, 2^20181286372 is an apocalyptic number.

It is an amenable number.

20181286372 is a deficient number, since it is larger than the sum of its proper divisors (17859186644).

20181286372 is a wasteful number, since it uses less digits than its factorization.

20181286372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66447 (or 66445 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 20181286372 in words is "twenty billion, one hundred eighty-one million, two hundred eighty-six thousand, three hundred seventy-two".