20009201091 has 32 divisors (see below), whose sum is σ = 29255385600. Its totient is φ = 12063982080.

The previous prime is 20009201089. The next prime is 20009201117. The reversal of 20009201091 is 19010290002.

It is not a de Polignac number, because 20009201091 - 2¹ = 20009201089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20009201041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7667995 + ... + 7670603.

It is an arithmetic number, because the mean of its divisors is an integer number (914230800).

Almost surely, 2^20009201091 is an apocalyptic number.

20009201091 is a deficient number, since it is larger than the sum of its proper divisors (9246184509).

20009201091 is a wasteful number, since it uses less digits than its factorization.

20009201091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739.

The product of its (nonzero) digits is 324, while the sum is 24.

Adding to 20009201091 its reverse (19010290002), we get a palindrome (39019491093).

The spelling of 20009201091 in words is "twenty billion, nine million, two hundred one thousand, ninety-one".