20455051423405 has 4 divisors (see below), whose sum is σ = 24546061708092. Its totient is φ = 16364041138720.

The previous prime is 20455051423379. The next prime is 20455051423409. The reversal of 20455051423405 is 50432415055402.

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 3032658551209 + 17422392872196 = 1741453^2 + 4174014^2 .

It is not a de Polignac number, because 20455051423405 - 2⁹ = 20455051422893 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 (20455051423409) 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, 2045505142336 + ... + 2045505142345.

It is an arithmetic number, because the mean of its divisors is an integer number (6136515427023).

Almost surely, 2^{20455051423405} is an apocalyptic number.

It is an amenable number.

20455051423405 is a deficient number, since it is larger than the sum of its proper divisors (4091010284687).

20455051423405 is an equidigital number, since it uses as much as digits as its factorization.

20455051423405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091010284686.

The product of its (nonzero) digits is 480000, while the sum is 40.

Adding to 20455051423405 its reverse (50432415055402), we get a palindrome (70887466478807).

The spelling of 20455051423405 in words is "twenty trillion, four hundred fifty-five billion, fifty-one million, four hundred twenty-three thousand, four hundred five".