20641230 has 80 divisors (see below), whose sum is σ = 58806000. Its totient is φ = 5177088.

The previous prime is 20641223. The next prime is 20641253. The reversal of 20641230 is 3214602.

It is a happy number.

20641230 is a `hidden beast` number, since 2 + 0 + 641 + 23 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13021 + ... + 14519.

It is an arithmetic number, because the mean of its divisors is an integer number (735075).

Almost surely, 2^20641230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20641230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29403000).

20641230 is an abundant number, since it is smaller than the sum of its proper divisors (38164770).

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

20641230 is a wasteful number, since it uses less digits than its factorization.

20641230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20641230 is about 4543.2620439504. The cubic root of 20641230 is about 274.3122428303.

Adding to 20641230 its reverse (3214602), we get a palindrome (23855832).

The spelling of 20641230 in words is "twenty million, six hundred forty-one thousand, two hundred thirty".