20540402 has 16 divisors (see below), whose sum is σ = 31826520. Its totient is φ = 9934848.

The previous prime is 20540393. The next prime is 20540413. The reversal of 20540402 is 20404502.

It can be written as a sum of positive squares in 4 ways, for example, as 19882681 + 657721 = 4459^2 + 811^2 .

It is a super-2 number, since 2×20540402² = 843816228643208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13874 + ... + 15282.

Almost surely, 2^20540402 is an apocalyptic number.

20540402 is a deficient number, since it is larger than the sum of its proper divisors (11286118).

20540402 is a wasteful number, since it uses less digits than its factorization.

20540402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20540402 is about 4532.1520274589. The cubic root of 20540402 is about 273.8648613437.

Adding to 20540402 its reverse (20404502), we get a palindrome (40944904).

The spelling of 20540402 in words is "twenty million, five hundred forty thousand, four hundred two".