20642282871 has 12 divisors (see below), whose sum is σ = 32016602232. Its totient is φ = 11795590128.

The previous prime is 20642282867. The next prime is 20642282873. The reversal of 20642282871 is 17828224602.

It is not a de Polignac number, because 20642282871 - 2² = 20642282867 is a prime.

It is a super-2 number, since 2×20642282871² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642282873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70211700 + ... + 70211993.

It is an arithmetic number, because the mean of its divisors is an integer number (2668050186).

Almost surely, 2^20642282871 is an apocalyptic number.

20642282871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20642282871 is a deficient number, since it is larger than the sum of its proper divisors (11374319361).

20642282871 is a wasteful number, since it uses less digits than its factorization.

20642282871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140423710 (or 140423703 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The spelling of 20642282871 in words is "twenty billion, six hundred forty-two million, two hundred eighty-two thousand, eight hundred seventy-one".