20958911 has 8 divisors (see below), whose sum is σ = 22135680. Its totient is φ = 19804312.

The previous prime is 20958907. The next prime is 20958941. The reversal of 20958911 is 11985902.

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

It is a cyclic number.

It is not a de Polignac number, because 20958911 - 2² = 20958907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20958941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3581 + ... + 7398.

It is an arithmetic number, because the mean of its divisors is an integer number (2766960).

Almost surely, 2^20958911 is an apocalyptic number.

20958911 is a deficient number, since it is larger than the sum of its proper divisors (1176769).

20958911 is a wasteful number, since it uses less digits than its factorization.

20958911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11085.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 20958911 is about 4578.0903223943. The cubic root of 20958911 is about 275.7123613667.

The spelling of 20958911 in words is "twenty million, nine hundred fifty-eight thousand, nine hundred eleven".