20201343505 has 16 divisors (see below), whose sum is σ = 27715443840. Its totient is φ = 13846977792.

The previous prime is 20201343497. The next prime is 20201343517. The reversal of 20201343505 is 50534310202.

It is a cyclic number.

It is not a de Polignac number, because 20201343505 - 2³ = 20201343497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201343505.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19299 + ... + 201928.

It is an arithmetic number, because the mean of its divisors is an integer number (1732215240).

Almost surely, 2^20201343505 is an apocalyptic number.

It is an amenable number.

20201343505 is a deficient number, since it is larger than the sum of its proper divisors (7514100335).

20201343505 is a wasteful number, since it uses less digits than its factorization.

20201343505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223848.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20201343505 its reverse (50534310202), we get a palindrome (70735653707).

The spelling of 20201343505 in words is "twenty billion, two hundred one million, three hundred forty-three thousand, five hundred five".