20540404 has 12 divisors (see below), whose sum is σ = 36008644. Its totient is φ = 10252224.

The previous prime is 20540393. The next prime is 20540413. The reversal of 20540404 is 40404502.

It can be written as a sum of positive squares in 2 ways, for example, as 1004004 + 19536400 = 1002^2 + 4420^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1737 + ... + 6640.

Almost surely, 2^20540404 is an apocalyptic number.

It is an amenable number.

20540404 is a deficient number, since it is larger than the sum of its proper divisors (15468240).

20540404 is a wasteful number, since it uses less digits than its factorization.

20540404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8994 (or 8992 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20540404 is about 4532.1522481046. The cubic root of 20540404 is about 273.8648702324.

Adding to 20540404 its reverse (40404502), we get a palindrome (60944906).

The spelling of 20540404 in words is "twenty million, five hundred forty thousand, four hundred four".