20903984 has 10 divisors (see below), whose sum is σ = 40501500. Its totient is φ = 10451984.

The previous prime is 20903969. The next prime is 20903989. The reversal of 20903984 is 48930902.

It is not an unprimeable number, because it can be changed into a prime (20903989) 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, 653234 + ... + 653265.

It is an arithmetic number, because the mean of its divisors is an integer number (4050150).

Almost surely, 2^20903984 is an apocalyptic number.

It is an amenable number.

20903984 is a deficient number, since it is larger than the sum of its proper divisors (19597516).

20903984 is a wasteful number, since it uses less digits than its factorization.

20903984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306507 (or 1306501 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20903984 is about 4572.0874882268. The cubic root of 20903984 is about 275.4712976094.

The spelling of 20903984 in words is "twenty million, nine hundred three thousand, nine hundred eighty-four".