20781126 has 24 divisors (see below), whose sum is σ = 46074600. Its totient is φ = 6765696.

The previous prime is 20781091. The next prime is 20781133. The reversal of 20781126 is 62118702.

It is a self number, because there is not a number n which added to its sum of digits gives 20781126.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12651 + ... + 14198.

It is an arithmetic number, because the mean of its divisors is an integer number (1919775).

Almost surely, 2^20781126 is an apocalyptic number.

20781126 is an abundant number, since it is smaller than the sum of its proper divisors (25293474).

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

20781126 is a wasteful number, since it uses less digits than its factorization.

20781126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26900 (or 26897 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20781126 is about 4558.6320316516. The cubic root of 20781126 is about 274.9305653901.

Adding to 20781126 its reverse (62118702), we get a palindrome (82899828).

The spelling of 20781126 in words is "twenty million, seven hundred eighty-one thousand, one hundred twenty-six".