83020581 has 12 divisors (see below), whose sum is σ = 137049952. Its totient is φ = 47440296.

The previous prime is 83020577. The next prime is 83020583. The reversal of 83020581 is 18502038.

It is a happy number.

83020581 is a `hidden beast` number, since 83 + 0 + 2 + 0 + 581 = 666.

It is not a de Polignac number, because 83020581 - 2² = 83020577 is a prime.

It is a super-2 number, since 2×83020581² = 13784833739155122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83020583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 658831 + ... + 658956.

Almost surely, 2^83020581 is an apocalyptic number.

It is an amenable number.

83020581 is a deficient number, since it is larger than the sum of its proper divisors (54029371).

83020581 is a wasteful number, since it uses less digits than its factorization.

83020581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317800 (or 1317797 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 83020581 is about 9111.5630382498. The cubic root of 83020581 is about 436.2431186945.

The spelling of 83020581 in words is "eighty-three million, twenty thousand, five hundred eighty-one".