20446945 has 16 divisors (see below), whose sum is σ = 26095680. Its totient is φ = 15336000.

The previous prime is 20446897. The next prime is 20446957. The reversal of 20446945 is 54964402.

It is a de Polignac number, because none of the positive numbers 2^k-20446945 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20446945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8530 + ... + 10660.

It is an arithmetic number, because the mean of its divisors is an integer number (1630980).

Almost surely, 2^20446945 is an apocalyptic number.

It is an amenable number.

20446945 is a deficient number, since it is larger than the sum of its proper divisors (5648735).

20446945 is a wasteful number, since it uses less digits than its factorization.

20446945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20446945 is about 4521.8298287308. The cubic root of 20446945 is about 273.4488762287.

The spelling of 20446945 in words is "twenty million, four hundred forty-six thousand, nine hundred forty-five".