20645106 has 16 divisors (see below), whose sum is σ = 43719264. Its totient is φ = 6476864.

The previous prime is 20645083. The next prime is 20645111. The reversal of 20645106 is 60154602.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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, 101100 + ... + 101303.

It is an arithmetic number, because the mean of its divisors is an integer number (2732454).

Almost surely, 2^20645106 is an apocalyptic number.

20645106 is an abundant number, since it is smaller than the sum of its proper divisors (23074158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20645106 is a wasteful number, since it uses less digits than its factorization.

20645106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202425.

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

The square root of 20645106 is about 4543.6885896813. The cubic root of 20645106 is about 274.3294118283.

Adding to 20645106 its reverse (60154602), we get a palindrome (80799708).

The spelling of 20645106 in words is "twenty million, six hundred forty-five thousand, one hundred six".