20440072305 has 32 divisors (see below), whose sum is σ = 36432875520. Its totient is φ = 10872881280.

The previous prime is 20440072283. The next prime is 20440072321. The reversal of 20440072305 is 50327004402.

20440072305 is a `hidden beast` number, since 20 + 4 + 400 + 7 + 230 + 5 = 666.

It is not a de Polignac number, because 20440072305 - 2¹¹ = 20440070257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145956 + ... + 249365.

It is an arithmetic number, because the mean of its divisors is an integer number (1138527360).

Almost surely, 2^20440072305 is an apocalyptic number.

It is an amenable number.

20440072305 is a deficient number, since it is larger than the sum of its proper divisors (15992803215).

20440072305 is a wasteful number, since it uses less digits than its factorization.

20440072305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395718 (or 395712 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

Adding to 20440072305 its reverse (50327004402), we get a palindrome (70767076707).

The spelling of 20440072305 in words is "twenty billion, four hundred forty million, seventy-two thousand, three hundred five".