20440730671 has 4 divisors (see below), whose sum is σ = 20450415744. Its totient is φ = 20431045600.

The previous prime is 20440730593. The next prime is 20440730699. The reversal of 20440730671 is 17603704402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20440730671 - 2⁷ = 20440730543 is a prime.

It is a super-2 number, since 2×20440730671² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440730071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4839370 + ... + 4843591.

It is an arithmetic number, because the mean of its divisors is an integer number (5112603936).

Almost surely, 2^20440730671 is an apocalyptic number.

20440730671 is a deficient number, since it is larger than the sum of its proper divisors (9685073).

20440730671 is an equidigital number, since it uses as much as digits as its factorization.

20440730671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9685072.

The product of its (nonzero) digits is 28224, while the sum is 34.

The spelling of 20440730671 in words is "twenty billion, four hundred forty million, seven hundred thirty thousand, six hundred seventy-one".