20781327 has 16 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 11176320.

The previous prime is 20781311. The next prime is 20781329. The reversal of 20781327 is 72318702.

It is not a de Polignac number, because 20781327 - 2⁴ = 20781311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20781294 and 20781303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781329) 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, 28749 + ... + 29462.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^20781327 is an apocalyptic number.

20781327 is a deficient number, since it is larger than the sum of its proper divisors (12748785).

20781327 is a wasteful number, since it uses less digits than its factorization.

20781327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58238.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20781327 is about 4558.6540776856. The cubic root of 20781327 is about 274.9314517852.

The spelling of 20781327 in words is "twenty million, seven hundred eighty-one thousand, three hundred twenty-seven".