20791492609 has 24 divisors (see below), whose sum is σ = 22904164800. Its totient is φ = 18847315200.

The previous prime is 20791492607. The next prime is 20791492661. The reversal of 20791492609 is 90629419702.

It is not a de Polignac number, because 20791492609 - 2¹ = 20791492607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20791492607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3676434 + ... + 3682084.

It is an arithmetic number, because the mean of its divisors is an integer number (954340200).

Almost surely, 2^20791492609 is an apocalyptic number.

20791492609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20791492609 is a deficient number, since it is larger than the sum of its proper divisors (2112672191).

20791492609 is a wasteful number, since it uses less digits than its factorization.

20791492609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6153 (or 6136 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 20791492609 in words is "twenty billion, seven hundred ninety-one million, four hundred ninety-two thousand, six hundred nine".