20002170 has 64 divisors (see below), whose sum is σ = 50440320. Its totient is φ = 5069568.

The previous prime is 20002159. The next prime is 20002187. The reversal of 20002170 is 7120002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72072 + ... + 72348.

It is an arithmetic number, because the mean of its divisors is an integer number (788130).

Almost surely, 2^20002170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20002170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25220160).

20002170 is an abundant number, since it is smaller than the sum of its proper divisors (30438150).

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

20002170 is a wasteful number, since it uses less digits than its factorization.

20002170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 20002170 is about 4472.3785617946. The cubic root of 20002170 is about 271.4515784482.

Adding to 20002170 its reverse (7120002), we get a palindrome (27122172).

The spelling of 20002170 in words is "twenty million, two thousand, one hundred seventy".