20681055 has 32 divisors (see below), whose sum is σ = 36960000. Its totient is φ = 10971936.

The previous prime is 20681041. The next prime is 20681069. The reversal of 20681055 is 55018602.

It is an interprime number because it is at equal distance from previous prime (20681041) and next prime (20681069).

It is not a de Polignac number, because 20681055 - 2⁷ = 20680927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41196 + ... + 41694.

It is an arithmetic number, because the mean of its divisors is an integer number (1155000).

Almost surely, 2^20681055 is an apocalyptic number.

20681055 is a deficient number, since it is larger than the sum of its proper divisors (16278945).

20681055 is a wasteful number, since it uses less digits than its factorization.

20681055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 20681055 is about 4547.6427959988. The cubic root of 20681055 is about 274.4885480008.

Adding to 20681055 its reverse (55018602), we get a palindrome (75699657).

The spelling of 20681055 in words is "twenty million, six hundred eighty-one thousand, fifty-five".