20982205671 has 12 divisors (see below), whose sum is σ = 32543829432. Its totient is φ = 11989831728.

The previous prime is 20982205667. The next prime is 20982205691. The reversal of 20982205671 is 17650228902.

It is not a de Polignac number, because 20982205671 - 2² = 20982205667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20982205661) 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 11 ways as a sum of consecutive naturals, for example, 71367900 + ... + 71368193.

It is an arithmetic number, because the mean of its divisors is an integer number (2711985786).

Almost surely, 2^20982205671 is an apocalyptic number.

20982205671 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20982205671 is a deficient number, since it is larger than the sum of its proper divisors (11561623761).

20982205671 is a wasteful number, since it uses less digits than its factorization.

20982205671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142736110 (or 142736103 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 20982205671 in words is "twenty billion, nine hundred eighty-two million, two hundred five thousand, six hundred seventy-one".