20681283 has 12 divisors (see below), whose sum is σ = 32077320. Its totient is φ = 11817792.

The previous prime is 20681251. The next prime is 20681303. The reversal of 20681283 is 38218602.

It is not a de Polignac number, because 20681283 - 2⁵ = 20681251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20681283.

It is not an unprimeable number, because it can be changed into a prime (20681203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70198 + ... + 70491.

It is an arithmetic number, because the mean of its divisors is an integer number (2673110).

Almost surely, 2^20681283 is an apocalyptic number.

20681283 is a deficient number, since it is larger than the sum of its proper divisors (11396037).

20681283 is a wasteful number, since it uses less digits than its factorization.

20681283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140706 (or 140699 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20681283 is about 4547.6678638617. The cubic root of 20681283 is about 274.4895567044.

Adding to 20681283 its reverse (38218602), we get a palindrome (58899885).

The spelling of 20681283 in words is "twenty million, six hundred eighty-one thousand, two hundred eighty-three".