671658732020 has 24 divisors (see below), whose sum is σ = 1484719303200. Its totient is φ = 254523308832.

The previous prime is 671658731987. The next prime is 671658732049. The reversal of 671658732020 is 20237856176.

It is a super-2 number, since 2×671658732020² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883761110 + ... + 883761869.

It is an arithmetic number, because the mean of its divisors is an integer number (61863304300).

Almost surely, 2^671658732020 is an apocalyptic number.

It is an amenable number.

671658732020 is an abundant number, since it is smaller than the sum of its proper divisors (813060571180).

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

671658732020 is a wasteful number, since it uses less digits than its factorization.

671658732020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767523007 (or 1767523005 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 671658732020 in words is "six hundred seventy-one billion, six hundred fifty-eight million, seven hundred thirty-two thousand, twenty".