81041020 has 12 divisors (see below), whose sum is σ = 170186184. Its totient is φ = 32416400.

The previous prime is 81041017. The next prime is 81041041. The reversal of 81041020 is 2014018.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81040985 and 81041003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026006 + ... + 2026045.

It is an arithmetic number, because the mean of its divisors is an integer number (14182182).

Almost surely, 2^81041020 is an apocalyptic number.

It is an amenable number.

81041020 is an abundant number, since it is smaller than the sum of its proper divisors (89145164).

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

81041020 is a wasteful number, since it uses less digits than its factorization.

81041020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052060 (or 4052058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 81041020 is about 9002.2786004433. The cubic root of 81041020 is about 432.7478971335.

Adding to 81041020 its reverse (2014018), we get a palindrome (83055038).

The spelling of 81041020 in words is "eighty-one million, forty-one thousand, twenty".