20510404 has 12 divisors (see below), whose sum is σ = 36211644. Its totient is φ = 10164224.

The previous prime is 20510393. The next prime is 20510419. The reversal of 20510404 is 40401502.

It can be written as a sum of positive squares in 2 ways, for example, as 4494400 + 16016004 = 2120^2 + 4002^2 .

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, 22237 + ... + 23140.

It is an arithmetic number, because the mean of its divisors is an integer number (3017637).

Almost surely, 2^20510404 is an apocalyptic number.

It is an amenable number.

20510404 is a deficient number, since it is larger than the sum of its proper divisors (15701240).

20510404 is a wasteful number, since it uses less digits than its factorization.

20510404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45494 (or 45492 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20510404 is about 4528.8413529290. The cubic root of 20510404 is about 273.7314754324.

Adding to 20510404 its reverse (40401502), we get a palindrome (60911906).

It can be divided in two parts, 205 and 10404, that added together give a square (10609 = 103²).

The spelling of 20510404 in words is "twenty million, five hundred ten thousand, four hundred four".