20001911091 has 8 divisors (see below), whose sum is σ = 26671947984. Its totient is φ = 13333240800.

The previous prime is 20001911053. The next prime is 20001911177. The reversal of 20001911091 is 19011910002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20001911091 - 2¹¹ = 20001909043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001918091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306996 + ... + 366401.

It is an arithmetic number, because the mean of its divisors is an integer number (3333993498).

Almost surely, 2^20001911091 is an apocalyptic number.

20001911091 is a deficient number, since it is larger than the sum of its proper divisors (6670036893).

20001911091 is an equidigital number, since it uses as much as digits as its factorization.

20001911091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683301.

The product of its (nonzero) digits is 162, while the sum is 24.

The spelling of 20001911091 in words is "twenty billion, one million, nine hundred eleven thousand, ninety-one".