20271005 has 32 divisors (see below), whose sum is σ = 26995200. Its totient is φ = 14556672.

The previous prime is 20270989. The next prime is 20271037. The reversal of 20271005 is 50017202.

It is a cyclic number.

It is not a de Polignac number, because 20271005 - 2⁴ = 20270989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256556 + ... + 256634.

It is an arithmetic number, because the mean of its divisors is an integer number (843600).

Almost surely, 2^20271005 is an apocalyptic number.

It is an amenable number.

20271005 is a deficient number, since it is larger than the sum of its proper divisors (6724195).

20271005 is a wasteful number, since it uses less digits than its factorization.

20271005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20271005 is about 4502.3332839762. Note that the first 3 decimals coincide. The cubic root of 20271005 is about 272.6622998592.

Adding to 20271005 its reverse (50017202), we get a palindrome (70288207).

The spelling of 20271005 in words is "twenty million, two hundred seventy-one thousand, five".