20783404 has 12 divisors (see below), whose sum is σ = 36883728. Its totient is φ = 10245200.

The previous prime is 20783393. The next prime is 20783407. The reversal of 20783404 is 40438702.

It is not an unprimeable number, because it can be changed into a prime (20783407) 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 3 ways as a sum of consecutive naturals, for example, 36307 + ... + 36874.

It is an arithmetic number, because the mean of its divisors is an integer number (3073644).

Almost surely, 2^20783404 is an apocalyptic number.

It is an amenable number.

20783404 is a deficient number, since it is larger than the sum of its proper divisors (16100324).

20783404 is a wasteful number, since it uses less digits than its factorization.

20783404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73256 (or 73254 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20783404 is about 4558.8818804615. The cubic root of 20783404 is about 274.9406108667.

The spelling of 20783404 in words is "twenty million, seven hundred eighty-three thousand, four hundred four".