20945205 has 24 divisors (see below), whose sum is σ = 36852192. Its totient is φ = 11002464.

The previous prime is 20945167. The next prime is 20945209. The reversal of 20945205 is 50254902.

20945205 is a `hidden beast` number, since 209 + 452 + 0 + 5 = 666.

It is not a de Polignac number, because 20945205 - 2¹⁰ = 20944181 is a prime.

It is a super-2 number, since 2×20945205² = 877403224984050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 459 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1535508).

Almost surely, 2^20945205 is an apocalyptic number.

It is an amenable number.

20945205 is a deficient number, since it is larger than the sum of its proper divisors (15906987).

20945205 is a wasteful number, since it uses less digits than its factorization.

20945205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025 (or 7022 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20945205 is about 4576.5931652267. The cubic root of 20945205 is about 275.6522479117.

The spelling of 20945205 in words is "twenty million, nine hundred forty-five thousand, two hundred five".