20645446106 has 8 divisors (see below), whose sum is σ = 31723490484. Its totient is φ = 10070949280.

The previous prime is 20645446043. The next prime is 20645446141. The reversal of 20645446106 is 60164454602.

It can be written as a sum of positive squares in 2 ways, for example, as 20632736881 + 12709225 = 143641^2 + 3565^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20645446106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125886785 + ... + 125886948.

Almost surely, 2^20645446106 is an apocalyptic number.

20645446106 is a deficient number, since it is larger than the sum of its proper divisors (11078044378).

20645446106 is a wasteful number, since it uses less digits than its factorization.

20645446106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251773776.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 20645446106 in words is "twenty billion, six hundred forty-five million, four hundred forty-six thousand, one hundred six".