71120020 has 12 divisors (see below), whose sum is σ = 149352084. Its totient is φ = 28448000.

The previous prime is 71120017. The next prime is 71120029. The reversal of 71120020 is 2002117.

It can be written as a sum of positive squares in 2 ways, for example, as 31404816 + 39715204 = 5604^2 + 6302^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71120029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777981 + ... + 1778020.

It is an arithmetic number, because the mean of its divisors is an integer number (12446007).

Almost surely, 2^71120020 is an apocalyptic number.

It is an amenable number.

71120020 is an abundant number, since it is smaller than the sum of its proper divisors (78232064).

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

71120020 is a wasteful number, since it uses less digits than its factorization.

71120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556010 (or 3556008 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 71120020 is about 8433.2686427031. The cubic root of 71120020 is about 414.3149679813.

Adding to 71120020 its reverse (2002117), we get a palindrome (73122137).

The spelling of 71120020 in words is "seventy-one million, one hundred twenty thousand, twenty".