20858006091 has 32 divisors (see below), whose sum is σ = 30318382080. Its totient is φ = 12678107904.

The previous prime is 20858006089. The next prime is 20858006107. The reversal of 20858006091 is 19060085802.

It is not a de Polignac number, because 20858006091 - 2¹ = 20858006089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20858006051) 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, 4034190 + ... + 4039356.

It is an arithmetic number, because the mean of its divisors is an integer number (947449440).

Almost surely, 2^20858006091 is an apocalyptic number.

20858006091 is a deficient number, since it is larger than the sum of its proper divisors (9460375989).

20858006091 is a wasteful number, since it uses less digits than its factorization.

20858006091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 20858006091 in words is "twenty billion, eight hundred fifty-eight million, six thousand, ninety-one".