20921104 has 20 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 10414880.

The previous prime is 20921083. The next prime is 20921119. The reversal of 20921104 is 40112902.

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, 1089 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^20921104 is an apocalyptic number.

It is an amenable number.

20921104 is a deficient number, since it is larger than the sum of its proper divisors (19790576).

20921104 is a wasteful number, since it uses less digits than its factorization.

20921104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718 (or 5712 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20921104 is about 4573.9593351931. The cubic root of 20921104 is about 275.5464791592.

It can be divided in two parts, 20921 and 104, that added together give a square (21025 = 145²).

The spelling of 20921104 in words is "twenty million, nine hundred twenty-one thousand, one hundred four".