20315405 has 32 divisors (see below), whose sum is σ = 27907200. Its totient is φ = 14065920.

The previous prime is 20315401. The next prime is 20315413. The reversal of 20315405 is 50451302.

It is not a de Polignac number, because 20315405 - 2² = 20315401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136271 + ... + 136419.

It is an arithmetic number, because the mean of its divisors is an integer number (872100).

Almost surely, 2^20315405 is an apocalyptic number.

It is an amenable number.

20315405 is a deficient number, since it is larger than the sum of its proper divisors (7591795).

20315405 is a wasteful number, since it uses less digits than its factorization.

20315405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20315405 is about 4507.2613636220. The cubic root of 20315405 is about 272.8612273097.

Adding to 20315405 its reverse (50451302), we get a palindrome (70766707).

The spelling of 20315405 in words is "twenty million, three hundred fifteen thousand, four hundred five".