85000020 has 48 divisors (see below), whose sum is σ = 272001408. Its totient is φ = 19428480.

The previous prime is 85000009. The next prime is 85000021. The reversal of 85000020 is 2000058.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85000021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100771 + ... + 101610.

It is an arithmetic number, because the mean of its divisors is an integer number (5666696).

Almost surely, 2^85000020 is an apocalyptic number.

It is an amenable number.

85000020 is an abundant number, since it is smaller than the sum of its proper divisors (187001388).

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

85000020 is a wasteful number, since it uses less digits than its factorization.

85000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202400 (or 202398 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 85000020 is about 9219.5455419451. The cubic root of 85000020 is about 439.6830017008.

Adding to 85000020 its reverse (2000058), we get a palindrome (87000078).

The spelling of 85000020 in words is "eighty-five million, twenty", and thus it is an aban number and an uban number.