20665230 has 64 divisors (see below), whose sum is σ = 51928128. Its totient is φ = 5258240.

The previous prime is 20665213. The next prime is 20665237. The reversal of 20665230 is 3256602.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20665230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65032 + ... + 65348.

It is an arithmetic number, because the mean of its divisors is an integer number (811377).

Almost surely, 2^20665230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20665230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25964064).

20665230 is an abundant number, since it is smaller than the sum of its proper divisors (31262898).

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

20665230 is a wasteful number, since it uses less digits than its factorization.

20665230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20665230 is about 4545.9025506493. The cubic root of 20665230 is about 274.4185178906.

The spelling of 20665230 in words is "twenty million, six hundred sixty-five thousand, two hundred thirty".