20413515004405 has 4 divisors (see below), whose sum is σ = 24496218005292. Its totient is φ = 16330812003520.

The previous prime is 20413515004381. The next prime is 20413515004409. The reversal of 20413515004405 is 50440051531402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3327709288401 + 17085805716004 = 1824201^2 + 4133498^2 .

It is not a de Polignac number, because 20413515004405 - 2³⁷ = 20276076050933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413515004409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041351500436 + ... + 2041351500445.

It is an arithmetic number, because the mean of its divisors is an integer number (6124054501323).

Almost surely, 2^{20413515004405} is an apocalyptic number.

It is an amenable number.

20413515004405 is a deficient number, since it is larger than the sum of its proper divisors (4082703000887).

20413515004405 is an equidigital number, since it uses as much as digits as its factorization.

20413515004405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082703000886.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 20413515004405 its reverse (50440051531402), we get a palindrome (70853566535807).

The spelling of 20413515004405 in words is "twenty trillion, four hundred thirteen billion, five hundred fifteen million, four thousand, four hundred five".