20419904 has 14 divisors (see below), whose sum is σ = 40520874. Its totient is φ = 10209920.

The previous prime is 20419897. The next prime is 20419943. The reversal of 20419904 is 40991402.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 5053504 = 3920^2 + 2248^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 159467 + ... + 159594.

Almost surely, 2^20419904 is an apocalyptic number.

It is an amenable number.

20419904 is a deficient number, since it is larger than the sum of its proper divisors (20100970).

20419904 is an equidigital number, since it uses as much as digits as its factorization.

20419904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319073 (or 319063 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20419904 is about 4518.8387888926. The cubic root of 20419904 is about 273.3282780478.

The spelling of 20419904 in words is "twenty million, four hundred nineteen thousand, nine hundred four".