185128732020 has 96 divisors (see below), whose sum is σ = 536574326400. Its totient is φ = 47635162624.

The previous prime is 185128732003. The next prime is 185128732099. The reversal of 185128732020 is 20237821581.

It is a self number, because there is not a number n which added to its sum of digits gives 185128732020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2784202 + ... + 2849918.

It is an arithmetic number, because the mean of its divisors is an integer number (5589315900).

Almost surely, 2^185128732020 is an apocalyptic number.

185128732020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 185128732020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268287163200).

185128732020 is an abundant number, since it is smaller than the sum of its proper divisors (351445594380).

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

185128732020 is a wasteful number, since it uses less digits than its factorization.

185128732020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67377 (or 67375 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 185128732020 in words is "one hundred eighty-five billion, one hundred twenty-eight million, seven hundred thirty-two thousand, twenty".