71531020 has 48 divisors (see below), whose sum is σ = 164447136. Its totient is φ = 25920000.

The previous prime is 71531017. The next prime is 71531051. The reversal of 71531020 is 2013517.

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 15 ways as a sum of consecutive naturals, for example, 118720 + ... + 119320.

It is an arithmetic number, because the mean of its divisors is an integer number (3425982).

Almost surely, 2^71531020 is an apocalyptic number.

It is an amenable number.

71531020 is an abundant number, since it is smaller than the sum of its proper divisors (92916116).

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

71531020 is a wasteful number, since it uses less digits than its factorization.

71531020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 71531020 is about 8457.6013147937. The cubic root of 71531020 is about 415.1115391873. Note that the first 3 decimals are identical.

Adding to 71531020 its reverse (2013517), we get a palindrome (73544537).

The spelling of 71531020 in words is "seventy-one million, five hundred thirty-one thousand, twenty".