20794155605 has 6 divisors (see below), whose sum is σ = 24953373666. Its totient is φ = 16635066528.

The previous prime is 20794155589. The next prime is 20794155667. The reversal of 20794155605 is 50655149702.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3792342724 + 17001812881 = 61582^2 + 130391^2 .

It is not a de Polignac number, because 20794155605 - 2⁴ = 20794155589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 290201 + ... + 354689.

It is an arithmetic number, because the mean of its divisors is an integer number (4158895611).

Almost surely, 2^20794155605 is an apocalyptic number.

It is an amenable number.

20794155605 is a deficient number, since it is larger than the sum of its proper divisors (4159218061).

20794155605 is an frugal number, since it uses more digits than its factorization.

20794155605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128983 (or 64494 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 20794155605 in words is "twenty billion, seven hundred ninety-four million, one hundred fifty-five thousand, six hundred five".