20305417 has 8 divisors (see below), whose sum is σ = 22667040. Its totient is φ = 18029760.

The previous prime is 20305409. The next prime is 20305421. The reversal of 20305417 is 71450302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20305417 - 2³ = 20305409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20305427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20992 + ... + 21937.

It is an arithmetic number, because the mean of its divisors is an integer number (2833380).

Almost surely, 2^20305417 is an apocalyptic number.

It is an amenable number.

20305417 is a deficient number, since it is larger than the sum of its proper divisors (2361623).

20305417 is a wasteful number, since it uses less digits than its factorization.

20305417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42983.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20305417 is about 4506.1532375187. The cubic root of 20305417 is about 272.8165028802.

Adding to 20305417 its reverse (71450302), we get a palindrome (91755719).

It can be divided in two parts, 2030 and 5417, that added together give a palindrome (7447).

The spelling of 20305417 in words is "twenty million, three hundred five thousand, four hundred seventeen".