20001982091 has 16 divisors (see below), whose sum is σ = 24643390464. Its totient is φ = 15809308704.

The previous prime is 20001982079. The next prime is 20001982123. The reversal of 20001982091 is 19028910002.

It is a happy number.

It is not a de Polignac number, because 20001982091 - 2⁶ = 20001982027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001982001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25655 + ... + 201648.

It is an arithmetic number, because the mean of its divisors is an integer number (1540211904).

Almost surely, 2^20001982091 is an apocalyptic number.

20001982091 is a deficient number, since it is larger than the sum of its proper divisors (4641408373).

20001982091 is a wasteful number, since it uses less digits than its factorization.

20001982091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228290.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 20001982091 in words is "twenty billion, one million, nine hundred eighty-two thousand, ninety-one".