20779539 has 8 divisors (see below), whose sum is σ = 30224832. Its totient is φ = 12593640.

The previous prime is 20779531. The next prime is 20779543. The reversal of 20779539 is 93597702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20779539 - 2³ = 20779531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20779539.

It is not an unprimeable number, because it can be changed into a prime (20779531) 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 7 ways as a sum of consecutive naturals, for example, 314809 + ... + 314874.

It is an arithmetic number, because the mean of its divisors is an integer number (3778104).

Almost surely, 2^20779539 is an apocalyptic number.

20779539 is a deficient number, since it is larger than the sum of its proper divisors (9445293).

20779539 is a wasteful number, since it uses less digits than its factorization.

20779539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629697.

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 20779539 is about 4558.4579629519. The cubic root of 20779539 is about 274.9235666369.

The spelling of 20779539 in words is "twenty million, seven hundred seventy-nine thousand, five hundred thirty-nine".