20993105 has 8 divisors (see below), whose sum is σ = 28790592. Its totient is φ = 14395248.

The previous prime is 20993087. The next prime is 20993111. The reversal of 20993105 is 50139902.

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

It is not a de Polignac number, because 20993105 - 2⁶ = 20993041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299867 + ... + 299936.

It is an arithmetic number, because the mean of its divisors is an integer number (3598824).

Almost surely, 2^20993105 is an apocalyptic number.

It is an amenable number.

20993105 is a deficient number, since it is larger than the sum of its proper divisors (7797487).

20993105 is an equidigital number, since it uses as much as digits as its factorization.

20993105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599815.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 20993105 is about 4581.8233270173. The cubic root of 20993105 is about 275.8622194405.

The spelling of 20993105 in words is "twenty million, nine hundred ninety-three thousand, one hundred five".