20173005 has 24 divisors (see below), whose sum is σ = 35544600. Its totient is φ = 10581120.

The previous prime is 20172989. The next prime is 20173051. The reversal of 20173005 is 50037102.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 19900521 = 522^2 + 4461^2 .

It is not a de Polignac number, because 20173005 - 2⁴ = 20172989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 930 + ... + 6419.

It is an arithmetic number, because the mean of its divisors is an integer number (1481025).

Almost surely, 2^20173005 is an apocalyptic number.

It is an amenable number.

20173005 is a deficient number, since it is larger than the sum of its proper divisors (15371595).

20173005 is a wasteful number, since it uses less digits than its factorization.

20173005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421 (or 7418 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20173005 is about 4491.4368525005. The cubic root of 20173005 is about 272.2221953507. Note that the first 3 decimals are identical.

The spelling of 20173005 in words is "twenty million, one hundred seventy-three thousand, five".