20423434305545 has 8 divisors (see below), whose sum is σ = 24645038045760. Its totient is φ = 16247469525040.

The previous prime is 20423434305473. The next prime is 20423434305581. The reversal of 20423434305545 is 54550343432402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20423434305545 - 2¹² = 20423434301449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20423434305496 and 20423434305505.

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, 11409738941 + ... + 11409740730.

It is an arithmetic number, because the mean of its divisors is an integer number (3080629755720).

Almost surely, 2^{20423434305545} is an apocalyptic number.

It is an amenable number.

20423434305545 is a deficient number, since it is larger than the sum of its proper divisors (4221603740215).

20423434305545 is a wasteful number, since it uses less digits than its factorization.

20423434305545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22819479855.

The product of its (nonzero) digits is 3456000, while the sum is 44.

Adding to 20423434305545 its reverse (54550343432402), we get a palindrome (74973777737947).

The spelling of 20423434305545 in words is "twenty trillion, four hundred twenty-three billion, four hundred thirty-four million, three hundred five thousand, five hundred forty-five".