71405020 has 24 divisors (see below), whose sum is σ = 150109344. Its totient is φ = 28531776.

The previous prime is 71405017. The next prime is 71405027. The reversal of 71405020 is 2050417.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71405027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35974 + ... + 37906.

It is an arithmetic number, because the mean of its divisors is an integer number (6254556).

Almost surely, 2^71405020 is an apocalyptic number.

It is an amenable number.

71405020 is an abundant number, since it is smaller than the sum of its proper divisors (78704324).

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

71405020 is a wasteful number, since it uses less digits than its factorization.

71405020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789 (or 3787 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 71405020 is about 8450.1491111104. The cubic root of 71405020 is about 414.8676599362.

Adding to 71405020 its reverse (2050417), we get a palindrome (73455437).

The spelling of 71405020 in words is "seventy-one million, four hundred five thousand, twenty".