20471130 has 80 divisors (see below), whose sum is σ = 55756800. Its totient is φ = 5388768.

The previous prime is 20471119. The next prime is 20471137. The reversal of 20471130 is 3117402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20471137) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 102771 + ... + 102969.

It is an arithmetic number, because the mean of its divisors is an integer number (696960).

Almost surely, 2^20471130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20471130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27878400).

20471130 is an abundant number, since it is smaller than the sum of its proper divisors (35285670).

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

20471130 is a wasteful number, since it uses less digits than its factorization.

20471130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20471130 is about 4524.5032876549. The cubic root of 20471130 is about 273.5566471014.

Adding to 20471130 its reverse (3117402), we get a palindrome (23588532).

The spelling of 20471130 in words is "twenty million, four hundred seventy-one thousand, one hundred thirty".