20681030 has 16 divisors (see below), whose sum is σ = 38427264. Its totient is φ = 8005440.

The previous prime is 20681029. The next prime is 20681033. The reversal of 20681030 is 3018602.

It is a junction number, because it is equal to n+sod(n) for n = 20680993 and 20681011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33047 + ... + 33666.

It is an arithmetic number, because the mean of its divisors is an integer number (2401704).

Almost surely, 2^20681030 is an apocalyptic number.

20681030 is a deficient number, since it is larger than the sum of its proper divisors (17746234).

20681030 is a wasteful number, since it uses less digits than its factorization.

20681030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66751.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20681030 is about 4547.6400473212. The cubic root of 20681030 is about 274.4884373969.

Adding to 20681030 its reverse (3018602), we get a palindrome (23699632).

The spelling of 20681030 in words is "twenty million, six hundred eighty-one thousand, thirty".