81893020 has 24 divisors (see below), whose sum is σ = 187609968. Its totient is φ = 29779200.

The previous prime is 81892997. The next prime is 81893023. The reversal of 81893020 is 2039818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185901 + ... + 186340.

It is an arithmetic number, because the mean of its divisors is an integer number (7817082).

Almost surely, 2^81893020 is an apocalyptic number.

It is an amenable number.

81893020 is an abundant number, since it is smaller than the sum of its proper divisors (105716948).

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

81893020 is a wasteful number, since it uses less digits than its factorization.

81893020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372261 (or 372259 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 81893020 is about 9049.4762279372. The cubic root of 81893020 is about 434.2591343917.

The spelling of 81893020 in words is "eighty-one million, eight hundred ninety-three thousand, twenty".