20786404 has 6 divisors (see below), whose sum is σ = 36376214. Its totient is φ = 10393200.

The previous prime is 20786377. The next prime is 20786407. The reversal of 20786404 is 40468702.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 518400 = 4502^2 + 720^2 .

It is not an unprimeable number, because it can be changed into a prime (20786407) 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 as a sum of consecutive naturals, namely, 2598297 + ... + 2598304.

Almost surely, 2^20786404 is an apocalyptic number.

It is an amenable number.

20786404 is a deficient number, since it is larger than the sum of its proper divisors (15589810).

20786404 is a wasteful number, since it uses less digits than its factorization.

20786404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196605 (or 5196603 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20786404 is about 4559.2108966355. The cubic root of 20786404 is about 274.9538390839.

The spelling of 20786404 in words is "twenty million, seven hundred eighty-six thousand, four hundred four".