20489204 has 6 divisors (see below), whose sum is σ = 35856114. Its totient is φ = 10244600.

The previous prime is 20489191. The next prime is 20489221. The reversal of 20489204 is 40298402.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 2016400 = 4298^2 + 1420^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2561147 + ... + 2561154.

It is an arithmetic number, because the mean of its divisors is an integer number (5976019).

Almost surely, 2^20489204 is an apocalyptic number.

It is an amenable number.

20489204 is a deficient number, since it is larger than the sum of its proper divisors (15366910).

20489204 is a wasteful number, since it uses less digits than its factorization.

20489204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122305 (or 5122303 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20489204 is about 4526.5001933061. The cubic root of 20489204 is about 273.6371313159.

The spelling of 20489204 in words is "twenty million, four hundred eighty-nine thousand, two hundred four".