20573666 has 8 divisors (see below), whose sum is σ = 30895020. Its totient is φ = 10275328.

The previous prime is 20573647. The next prime is 20573669. The reversal of 20573666 is 66637502.

It can be written as a sum of positive squares in 2 ways, for example, as 16982641 + 3591025 = 4121^2 + 1895^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20573669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3311 + ... + 7218.

Almost surely, 2^20573666 is an apocalyptic number.

20573666 is a deficient number, since it is larger than the sum of its proper divisors (10321354).

20573666 is a wasteful number, since it uses less digits than its factorization.

20573666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11508.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 20573666 is about 4535.8203227200. The cubic root of 20573666 is about 274.0126177435.

The spelling of 20573666 in words is "twenty million, five hundred seventy-three thousand, six hundred sixty-six".