20681300 has 18 divisors (see below), whose sum is σ = 44878638. Its totient is φ = 8272480.

The previous prime is 20681251. The next prime is 20681303. The reversal of 20681300 is 318602.

It can be written as a sum of positive squares in 3 ways, for example, as 3225616 + 17455684 = 1796^2 + 4178^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103307 + ... + 103506.

Almost surely, 2^20681300 is an apocalyptic number.

20681300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20681300 is an abundant number, since it is smaller than the sum of its proper divisors (24197338).

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

20681300 is a wasteful number, since it uses less digits than its factorization.

20681300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206827 (or 206820 counting only the distinct ones).

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

The square root of 20681300 is about 4547.6697329512. The cubic root of 20681300 is about 274.4896319144.

Adding to 20681300 its reverse (318602), we get a palindrome (20999902).

The spelling of 20681300 in words is "twenty million, six hundred eighty-one thousand, three hundred".