20313630 has 96 divisors (see below), whose sum is σ = 56216160. Its totient is φ = 5080320.

The previous prime is 20313619. The next prime is 20313647. The reversal of 20313630 is 3631302.

It is a happy number.

20313630 is a `hidden beast` number, since 2 + 0 + 31 + 3 + 630 = 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 47 ways as a sum of consecutive naturals, for example, 112140 + ... + 112320.

It is an arithmetic number, because the mean of its divisors is an integer number (585585).

Almost surely, 2^20313630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20313630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28108080).

20313630 is an abundant number, since it is smaller than the sum of its proper divisors (35902530).

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

20313630 is a wasteful number, since it uses less digits than its factorization.

20313630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 20313630 is about 4507.0644548309. The cubic root of 20313630 is about 272.8532802569.

Adding to 20313630 its reverse (3631302), we get a palindrome (23944932).

The spelling of 20313630 in words is "twenty million, three hundred thirteen thousand, six hundred thirty".