71070020 has 48 divisors (see below), whose sum is σ = 171763200. Its totient is φ = 24196224.

The previous prime is 71070019. The next prime is 71070029. The reversal of 71070020 is 2007017.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (71070029) by changing a digit.

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, 19157 + ... + 22563.

It is an arithmetic number, because the mean of its divisors is an integer number (3578400).

Almost surely, 2^71070020 is an apocalyptic number.

71070020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71070020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85881600).

71070020 is an abundant number, since it is smaller than the sum of its proper divisors (100693180).

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

71070020 is a wasteful number, since it uses less digits than its factorization.

71070020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 3570 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 71070020 is about 8430.3036718733. The cubic root of 71070020 is about 414.2178523124.

Adding to 71070020 its reverse (2007017), we get a palindrome (73077037).

The spelling of 71070020 in words is "seventy-one million, seventy thousand, twenty".