20307630 has 32 divisors (see below), whose sum is σ = 55701504. Its totient is φ = 4641696.

The previous prime is 20307593. The next prime is 20307631. The reversal of 20307630 is 3670302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20307597 and 20307606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20307631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48142 + ... + 48561.

It is an arithmetic number, because the mean of its divisors is an integer number (1740672).

Almost surely, 2^20307630 is an apocalyptic number.

20307630 is an abundant number, since it is smaller than the sum of its proper divisors (35393874).

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

20307630 is a wasteful number, since it uses less digits than its factorization.

20307630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96720.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 20307630 is about 4506.3987839515. The cubic root of 20307630 is about 272.8264135523.

Adding to 20307630 its reverse (3670302), we get a palindrome (23977932).

The spelling of 20307630 in words is "twenty million, three hundred seven thousand, six hundred thirty".