20330781609 has 16 divisors (see below), whose sum is σ = 27631124352. Its totient is φ = 13292368128.

The previous prime is 20330781607. The next prime is 20330781617. The reversal of 20330781609 is 90618703302.

It is not a de Polignac number, because 20330781609 - 2¹ = 20330781607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20330781607) 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, 357852 + ... + 410754.

It is an arithmetic number, because the mean of its divisors is an integer number (1726945272).

Almost surely, 2^20330781609 is an apocalyptic number.

It is an amenable number.

20330781609 is a deficient number, since it is larger than the sum of its proper divisors (7300342743).

20330781609 is a wasteful number, since it uses less digits than its factorization.

20330781609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55376.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 20330781609 in words is "twenty billion, three hundred thirty million, seven hundred eighty-one thousand, six hundred nine".