20354102251605 has 24 divisors (see below), whose sum is σ = 36233969416632. Its totient is φ = 10562128735104.

The previous prime is 20354102251541. The next prime is 20354102251627. The reversal of 20354102251605 is 50615220145302.

20354102251605 is a `hidden beast` number, since 2 + 0 + 3 + 5 + 41 + 0 + 2 + 2 + 5 + 1 + 605 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4085609221521 + 16268493030084 = 2021289^2 + 4033422^2 .

It is not a de Polignac number, because 20354102251605 - 2⁶ = 20354102251541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20354102251605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6112341354 + ... + 6112344683.

It is an arithmetic number, because the mean of its divisors is an integer number (1509748725693).

Almost surely, 2^{20354102251605} is an apocalyptic number.

It is an amenable number.

20354102251605 is a deficient number, since it is larger than the sum of its proper divisors (15879867165027).

20354102251605 is a wasteful number, since it uses less digits than its factorization.

20354102251605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12224686085 (or 12224686082 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 20354102251605 its reverse (50615220145302), we get a palindrome (70969322396907).

The spelling of 20354102251605 in words is "twenty trillion, three hundred fifty-four billion, one hundred two million, two hundred fifty-one thousand, six hundred five".