71808020 has 24 divisors (see below), whose sum is σ = 151728864. Its totient is φ = 28545696.

The previous prime is 71808019. The next prime is 71808073. The reversal of 71808020 is 2080817.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7754 + ... + 14273.

It is an arithmetic number, because the mean of its divisors is an integer number (6322036).

Almost surely, 2^71808020 is an apocalyptic number.

It is an amenable number.

71808020 is an abundant number, since it is smaller than the sum of its proper divisors (79920844).

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

71808020 is a wasteful number, since it uses less digits than its factorization.

71808020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22199 (or 22197 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 71808020 is about 8473.9612932795. The cubic root of 71808020 is about 415.6466813270.

Adding to 71808020 its reverse (2080817), we get a palindrome (73888837).

The spelling of 71808020 in words is "seventy-one million, eight hundred eight thousand, twenty".