91784552020 has 48 divisors (see below), whose sum is σ = 220301238528. Its totient is φ = 31466373120.

The previous prime is 91784552003. The next prime is 91784552059. The reversal of 91784552020 is 2025548719.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2490649 + ... + 2527231.

It is an arithmetic number, because the mean of its divisors is an integer number (4589609136).

Almost surely, 2^91784552020 is an apocalyptic number.

It is an amenable number.

91784552020 is an abundant number, since it is smaller than the sum of its proper divisors (128516686508).

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

91784552020 is a wasteful number, since it uses less digits than its factorization.

91784552020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54520 (or 54518 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 91784552020 in words is "ninety-one billion, seven hundred eighty-four million, five hundred fifty-two thousand, twenty".