20434604217 has 16 divisors (see below), whose sum is σ = 27635530752. Its totient is φ = 13428452240.

The previous prime is 20434604209. The next prime is 20434604261. The reversal of 20434604217 is 71240643402.

It is a cyclic number.

It is not a de Polignac number, because 20434604217 - 2³ = 20434604209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20434604297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2037028 + ... + 2047034.

It is an arithmetic number, because the mean of its divisors is an integer number (1727220672).

Almost surely, 2^20434604217 is an apocalyptic number.

It is an amenable number.

20434604217 is a deficient number, since it is larger than the sum of its proper divisors (7200926535).

20434604217 is a wasteful number, since it uses less digits than its factorization.

20434604217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19668.

The product of its (nonzero) digits is 32256, while the sum is 33.

The spelling of 20434604217 in words is "twenty billion, four hundred thirty-four million, six hundred four thousand, two hundred seventeen".