20681101 has 16 divisors (see below), whose sum is σ = 25090560. Its totient is φ = 16651440.

The previous prime is 20681083. The next prime is 20681107. The reversal of 20681101 is 10118602.

It is a cyclic number.

It is not a de Polignac number, because 20681101 - 2⁵ = 20681069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16830 + ... + 18016.

It is an arithmetic number, because the mean of its divisors is an integer number (1568160).

Almost surely, 2^20681101 is an apocalyptic number.

It is an amenable number.

20681101 is a deficient number, since it is larger than the sum of its proper divisors (4409459).

20681101 is a wasteful number, since it uses less digits than its factorization.

20681101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 20681101 is about 4547.6478535612. The cubic root of 20681101 is about 274.4887515118.

Adding to 20681101 its reverse (10118602), we get a palindrome (30799703).

The spelling of 20681101 in words is "twenty million, six hundred eighty-one thousand, one hundred one".