20265217 has 4 divisors (see below), whose sum is σ = 23160256. Its totient is φ = 17370180.

The previous prime is 20265199. The next prime is 20265247. The reversal of 20265217 is 71256202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20265217 - 2²³ = 11876609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20265191 and 20265200.

It is not an unprimeable number, because it can be changed into a prime (20265247) 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, 1447509 + ... + 1447522.

It is an arithmetic number, because the mean of its divisors is an integer number (5790064).

Almost surely, 2^20265217 is an apocalyptic number.

It is an amenable number.

20265217 is a deficient number, since it is larger than the sum of its proper divisors (2895039).

20265217 is an equidigital number, since it uses as much as digits as its factorization.

20265217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895038.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20265217 is about 4501.6904602605. The cubic root of 20265217 is about 272.6363462106.

The spelling of 20265217 in words is "twenty million, two hundred sixty-five thousand, two hundred seventeen".