202020891 has 16 divisors (see below), whose sum is σ = 282562560. Its totient is φ = 128142080.

The previous prime is 202020887. The next prime is 202020943. The reversal of 202020891 is 198020202.

It is a cyclic number.

It is not a de Polignac number, because 202020891 - 2² = 202020887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (202020811) by changing a digit.

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, 5515 + ... + 20843.

It is an arithmetic number, because the mean of its divisors is an integer number (17660160).

Almost surely, 2^202020891 is an apocalyptic number.

202020891 is a deficient number, since it is larger than the sum of its proper divisors (80541669).

202020891 is a wasteful number, since it uses less digits than its factorization.

202020891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15546.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 202020891 is about 14213.4053273661. The cubic root of 202020891 is about 586.7666574072.

The spelling of 202020891 in words is "two hundred two million, twenty thousand, eight hundred ninety-one".