19427220020905 has 16 divisors (see below), whose sum is σ = 24081133383504. Its totient is φ = 15034319159040.

The previous prime is 19427220020903. The next prime is 19427220020909. The reversal of 19427220020905 is 50902002272491.

It can be written as a sum of positive squares in 8 ways, for example, as 3667150249 + 19423552870656 = 60557^2 + 4407216^2 .

It is not a de Polignac number, because 19427220020905 - 2¹ = 19427220020903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19427220020903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303470886 + ... + 303534895.

It is an arithmetic number, because the mean of its divisors is an integer number (1505070836469).

Almost surely, 2^{19427220020905} is an apocalyptic number.

It is an amenable number.

19427220020905 is a deficient number, since it is larger than the sum of its proper divisors (4653913362599).

19427220020905 is a wasteful number, since it uses less digits than its factorization.

19427220020905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607005996.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 19427220020905 in words is "nineteen trillion, four hundred twenty-seven billion, two hundred twenty million, twenty thousand, nine hundred five".