20047170 has 64 divisors (see below), whose sum is σ = 56536704. Its totient is φ = 4485120.

The previous prime is 20047151. The next prime is 20047177. The reversal of 20047170 is 7174002.

It is not an unprimeable number, because it can be changed into a prime (20047177) 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 31 ways as a sum of consecutive naturals, for example, 1954 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (883386).

Almost surely, 2^20047170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20047170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28268352).

20047170 is an abundant number, since it is smaller than the sum of its proper divisors (36489534).

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

20047170 is a wasteful number, since it uses less digits than its factorization.

20047170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 20047170 is about 4477.4066154416. The cubic root of 20047170 is about 271.6549925772.

The spelling of 20047170 in words is "twenty million, forty-seven thousand, one hundred seventy".