20490104 has 8 divisors (see below), whose sum is σ = 38418960. Its totient is φ = 10245048.

The previous prime is 20490097. The next prime is 20490109. The reversal of 20490104 is 40109402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490109) 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, 1280624 + ... + 1280639.

It is an arithmetic number, because the mean of its divisors is an integer number (4802370).

Almost surely, 2^20490104 is an apocalyptic number.

It is an amenable number.

20490104 is a deficient number, since it is larger than the sum of its proper divisors (17928856).

20490104 is a wasteful number, since it uses less digits than its factorization.

20490104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561269 (or 2561265 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20490104 is about 4526.5996067689. The cubic root of 20490104 is about 273.6411378130.

Adding to 20490104 its reverse (40109402), we get a palindrome (60599506).

The spelling of 20490104 in words is "twenty million, four hundred ninety thousand, one hundred four".