20417205 has 16 divisors (see below), whose sum is σ = 32975424. Its totient is φ = 10786560.

The previous prime is 20417197. The next prime is 20417213. The reversal of 20417205 is 50271402.

It is an interprime number because it is at equal distance from previous prime (20417197) and next prime (20417213).

It is not a de Polignac number, because 20417205 - 2³ = 20417197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4756 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (2060964).

Almost surely, 2^20417205 is an apocalyptic number.

It is an amenable number.

20417205 is a deficient number, since it is larger than the sum of its proper divisors (12558219).

20417205 is a wasteful number, since it uses less digits than its factorization.

20417205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12836.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20417205 is about 4518.5401403551. The cubic root of 20417205 is about 273.3162351325.

Adding to 20417205 its reverse (50271402), we get a palindrome (70688607).

The spelling of 20417205 in words is "twenty million, four hundred seventeen thousand, two hundred five".