20005220505345 has 32 divisors (see below), whose sum is σ = 33892360889472. Its totient is φ = 10041491346432.

The previous prime is 20005220505329. The next prime is 20005220505383. The reversal of 20005220505345 is 54350502250002.

It is not a de Polignac number, because 20005220505345 - 2⁴ = 20005220505329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6175699 + ... + 8840231.

It is an arithmetic number, because the mean of its divisors is an integer number (1059136277796).

Almost surely, 2^{20005220505345} is an apocalyptic number.

It is an amenable number.

20005220505345 is a deficient number, since it is larger than the sum of its proper divisors (13887140384127).

20005220505345 is a wasteful number, since it uses less digits than its factorization.

20005220505345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694001.

The product of its (nonzero) digits is 60000, while the sum is 33.

Adding to 20005220505345 its reverse (54350502250002), we get a palindrome (74355722755347).

The spelling of 20005220505345 in words is "twenty trillion, five billion, two hundred twenty million, five hundred five thousand, three hundred forty-five".