20440072449 has 6 divisors (see below), whose sum is σ = 29524549106. Its totient is φ = 13626714960.

The previous prime is 20440072421. The next prime is 20440072463. The reversal of 20440072449 is 94427004402.

20440072449 is a `hidden beast` number, since 2 + 0 + 4 + 400 + 7 + 244 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16637130225 + 3802942224 = 128985^2 + 61668^2 .

It is not a de Polignac number, because 20440072449 - 2⁷ = 20440072321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440072249) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1135559572 + ... + 1135559589.

Almost surely, 2^20440072449 is an apocalyptic number.

It is an amenable number.

20440072449 is a deficient number, since it is larger than the sum of its proper divisors (9084476657).

20440072449 is a wasteful number, since it uses less digits than its factorization.

20440072449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271119167 (or 2271119164 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 20440072449 in words is "twenty billion, four hundred forty million, seventy-two thousand, four hundred forty-nine".