20201155 has 16 divisors (see below), whose sum is σ = 26276544. Its totient is φ = 14820480.

The previous prime is 20201143. The next prime is 20201173. The reversal of 20201155 is 55110202.

It is not a de Polignac number, because 20201155 - 2¹¹ = 20199107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9925 + ... + 11785.

It is an arithmetic number, because the mean of its divisors is an integer number (1642284).

Almost surely, 2^20201155 is an apocalyptic number.

20201155 is a deficient number, since it is larger than the sum of its proper divisors (6075389).

20201155 is a wasteful number, since it uses less digits than its factorization.

20201155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20201155 is about 4494.5695010757. The cubic root of 20201155 is about 272.3487587646.

Adding to 20201155 its reverse (55110202), we get a palindrome (75311357).

The spelling of 20201155 in words is "twenty million, two hundred one thousand, one hundred fifty-five".