20651404 has 12 divisors (see below), whose sum is σ = 38042200. Its totient is φ = 9782208.

The previous prime is 20651381. The next prime is 20651419. The reversal of 20651404 is 40415602.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 135789 + ... + 135940.

Almost surely, 2^20651404 is an apocalyptic number.

It is an amenable number.

20651404 is a deficient number, since it is larger than the sum of its proper divisors (17390796).

20651404 is a wasteful number, since it uses less digits than its factorization.

20651404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271752 (or 271750 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20651404 is about 4544.3815860907. The cubic root of 20651404 is about 274.3573046532.

The spelling of 20651404 in words is "twenty million, six hundred fifty-one thousand, four hundred four".