20412405 has 40 divisors (see below), whose sum is σ = 39415992. Its totient is φ = 10046592.

The previous prime is 20412397. The next prime is 20412409. The reversal of 20412405 is 50421402.

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 20412324 = 9^2 + 4518^2 .

It is not a de Polignac number, because 20412405 - 2³ = 20412397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412409) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3327 + ... + 7203.

Almost surely, 2^20412405 is an apocalyptic number.

It is an amenable number.

20412405 is a deficient number, since it is larger than the sum of its proper divisors (19003587).

20412405 is a wasteful number, since it uses less digits than its factorization.

20412405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907 (or 3898 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20412405 is about 4518.0089641345. The cubic root of 20412405 is about 273.2948149503.

Adding to 20412405 its reverse (50421402), we get a palindrome (70833807).

The spelling of 20412405 in words is "twenty million, four hundred twelve thousand, four hundred five".