20646105 has 8 divisors (see below), whose sum is σ = 33033792. Its totient is φ = 11011248.

The previous prime is 20646091. The next prime is 20646107. The reversal of 20646105 is 50164602.

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

It is not a de Polignac number, because 20646105 - 2⁴ = 20646089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20646107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688189 + ... + 688218.

It is an arithmetic number, because the mean of its divisors is an integer number (4129224).

Almost surely, 2^20646105 is an apocalyptic number.

It is an amenable number.

20646105 is a deficient number, since it is larger than the sum of its proper divisors (12387687).

20646105 is a wasteful number, since it uses less digits than its factorization.

20646105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376415.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20646105 is about 4543.7985210614. The cubic root of 20646105 is about 274.3338366165. Note that the first 3 decimals are identical.

The spelling of 20646105 in words is "twenty million, six hundred forty-six thousand, one hundred five".