20871134646 has 12 divisors (see below), whose sum is σ = 41742977052. Its totient is φ = 6956926924.

The previous prime is 20871134639. The next prime is 20871134663. The reversal of 20871134646 is 64643117802.

It is a super-2 number, since 2×20871134646² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20871134598 and 20871134607.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 324385 + ... + 383363.

It is an arithmetic number, because the mean of its divisors is an integer number (3478581421).

Almost surely, 2^20871134646 is an apocalyptic number.

20871134646 is an abundant number, since it is smaller than the sum of its proper divisors (20871842406).

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

20871134646 is an frugal number, since it uses more digits than its factorization.

20871134646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117963 (or 58984 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 20871134646 in words is "twenty billion, eight hundred seventy-one million, one hundred thirty-four thousand, six hundred forty-six".