20779684 has 6 divisors (see below), whose sum is σ = 36364454. Its totient is φ = 10389840.

The previous prime is 20779609. The next prime is 20779697. The reversal of 20779684 is 48697702.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 6110784 = 3830^2 + 2472^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20779684.

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 as a sum of consecutive naturals, namely, 2597457 + ... + 2597464.

Almost surely, 2^20779684 is an apocalyptic number.

It is an amenable number.

20779684 is a deficient number, since it is larger than the sum of its proper divisors (15584770).

20779684 is a wasteful number, since it uses less digits than its factorization.

20779684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5194925 (or 5194923 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20779684 is about 4558.4738674254. The cubic root of 20779684 is about 274.9242061093.

The spelling of 20779684 in words is "twenty million, seven hundred seventy-nine thousand, six hundred eighty-four".