20871466842 has 16 divisors (see below), whose sum is σ = 41754202560. Its totient is φ = 6955277472.

The previous prime is 20871466741. The next prime is 20871466843. The reversal of 20871466842 is 24866417802.

It is a junction number, because it is equal to n+sod(n) for n = 20871466791 and 20871466800.

It is not an unprimeable number, because it can be changed into a prime (20871466843) 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 7 ways as a sum of consecutive naturals, for example, 445363 + ... + 489990.

It is an arithmetic number, because the mean of its divisors is an integer number (2609637660).

Almost surely, 2^20871466842 is an apocalyptic number.

20871466842 is an abundant number, since it is smaller than the sum of its proper divisors (20882735718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20871466842 is a wasteful number, since it uses less digits than its factorization.

20871466842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939077.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 20871466842 in words is "twenty billion, eight hundred seventy-one million, four hundred sixty-six thousand, eight hundred forty-two".