20202021155 has 4 divisors (see below), whose sum is σ = 24242425392. Its totient is φ = 16161616920.

The previous prime is 20202021137. The next prime is 20202021163. The reversal of 20202021155 is 55112020202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20202021155 - 2⁸ = 20202020899 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 3 ways as a sum of consecutive naturals, for example, 2020202111 + ... + 2020202120.

It is an arithmetic number, because the mean of its divisors is an integer number (6060606348).

Almost surely, 2^20202021155 is an apocalyptic number.

20202021155 is a deficient number, since it is larger than the sum of its proper divisors (4040404237).

20202021155 is an equidigital number, since it uses as much as digits as its factorization.

20202021155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040404236.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 20202021155 its reverse (55112020202), we get a palindrome (75314041357).

The spelling of 20202021155 in words is "twenty billion, two hundred two million, twenty-one thousand, one hundred fifty-five".