20608465 has 4 divisors (see below), whose sum is σ = 24730164. Its totient is φ = 16486768.

The previous prime is 20608453. The next prime is 20608477. The reversal of 20608465 is 56480602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56480602 = 2 ⋅28240301.

It is an interprime number because it is at equal distance from previous prime (20608453) and next prime (20608477).

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 8994001 = 3408^2 + 2999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20608465 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2060842 + ... + 2060851.

It is an arithmetic number, because the mean of its divisors is an integer number (6182541).

Almost surely, 2^20608465 is an apocalyptic number.

It is an amenable number.

20608465 is a deficient number, since it is larger than the sum of its proper divisors (4121699).

20608465 is an equidigital number, since it uses as much as digits as its factorization.

20608465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121698.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20608465 is about 4539.6547225532. The cubic root of 20608465 is about 274.1670221487.

The spelling of 20608465 in words is "twenty million, six hundred eight thousand, four hundred sixty-five".