20217075 has 12 divisors (see below), whose sum is σ = 33425688. Its totient is φ = 10782400.

The previous prime is 20217019. The next prime is 20217077. The reversal of 20217075 is 57071202.

It is not a de Polignac number, because 20217075 - 2⁷ = 20216947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20217077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134706 + ... + 134855.

It is an arithmetic number, because the mean of its divisors is an integer number (2785474).

Almost surely, 2^20217075 is an apocalyptic number.

20217075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20217075 is a deficient number, since it is larger than the sum of its proper divisors (13208613).

20217075 is a wasteful number, since it uses less digits than its factorization.

20217075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269574 (or 269569 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20217075 is about 4496.3401784118. The cubic root of 20217075 is about 272.4202836149.

Adding to 20217075 its reverse (57071202), we get a palindrome (77288277).

The spelling of 20217075 in words is "twenty million, two hundred seventeen thousand, seventy-five".