20779065 has 32 divisors (see below), whose sum is σ = 38889600. Its totient is φ = 10497600.

The previous prime is 20779063. The next prime is 20779091. The reversal of 20779065 is 56097702.

It is not a de Polignac number, because 20779065 - 2¹ = 20779063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20779063) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1486 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (1215300).

Almost surely, 2^20779065 is an apocalyptic number.

It is an amenable number.

20779065 is a deficient number, since it is larger than the sum of its proper divisors (18110535).

20779065 is a wasteful number, since it uses less digits than its factorization.

20779065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8134 (or 8128 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 20779065 is about 4558.4059713896. The cubic root of 20779065 is about 274.9214762030.

The spelling of 20779065 in words is "twenty million, seven hundred seventy-nine thousand, sixty-five".