20201828191091 has 4 divisors (see below), whose sum is σ = 20208159071184. Its totient is φ = 20195497311000.

The previous prime is 20201828191063. The next prime is 20201828191121. The reversal of 20201828191091 is 19019182810202.

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

It is a cyclic number.

It is not a de Polignac number, because 20201828191091 - 2³⁴ = 20184648321907 is a prime.

It is a super-2 number, since 2×20201828191091² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201828121091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3165435260 + ... + 3165441641.

It is an arithmetic number, because the mean of its divisors is an integer number (5052039767796).

Almost surely, 2^{20201828191091} is an apocalyptic number.

20201828191091 is a deficient number, since it is larger than the sum of its proper divisors (6330880093).

20201828191091 is an equidigital number, since it uses as much as digits as its factorization.

20201828191091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330880092.

The product of its (nonzero) digits is 41472, while the sum is 44.

The spelling of 20201828191091 in words is "twenty trillion, two hundred one billion, eight hundred twenty-eight million, one hundred ninety-one thousand, ninety-one".