20779908 has 12 divisors (see below), whose sum is σ = 48486480. Its totient is φ = 6926632.

The previous prime is 20779897. The next prime is 20779919. The reversal of 20779908 is 80997702.

It is an interprime number because it is at equal distance from previous prime (20779897) and next prime (20779919).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20779908.

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 3 ways as a sum of consecutive naturals, for example, 865818 + ... + 865841.

It is an arithmetic number, because the mean of its divisors is an integer number (4040540).

Almost surely, 2^20779908 is an apocalyptic number.

It is an amenable number.

20779908 is an abundant number, since it is smaller than the sum of its proper divisors (27706572).

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

20779908 is a wasteful number, since it uses less digits than its factorization.

20779908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731666 (or 1731664 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 20779908 is about 4558.4984369856. The cubic root of 20779908 is about 274.9251939780.

The spelling of 20779908 in words is "twenty million, seven hundred seventy-nine thousand, nine hundred eight".