20217275 has 12 divisors (see below), whose sum is σ = 26998272. Its totient is φ = 14929440.

The previous prime is 20217269. The next prime is 20217283. The reversal of 20217275 is 57271202.

It is not a de Polignac number, because 20217275 - 2⁴ = 20217259 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30779 + ... + 31428.

It is an arithmetic number, because the mean of its divisors is an integer number (2249856).

Almost surely, 2^20217275 is an apocalyptic number.

20217275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20217275 is a deficient number, since it is larger than the sum of its proper divisors (6780997).

20217275 is a wasteful number, since it uses less digits than its factorization.

20217275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62230 (or 62225 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20217275 is about 4496.3624186669. The cubic root of 20217275 is about 272.4211819294.

Adding to 20217275 its reverse (57271202), we get a palindrome (77488477).

The spelling of 20217275 in words is "twenty million, two hundred seventeen thousand, two hundred seventy-five".