20145505 has 8 divisors (see below), whose sum is σ = 24954624. Its totient is φ = 15596400.

The previous prime is 20145487. The next prime is 20145509. The reversal of 20145505 is 50554102.

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

It is not a de Polignac number, because 20145505 - 2²³ = 11756897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145509) 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, 64831 + ... + 65140.

It is an arithmetic number, because the mean of its divisors is an integer number (3119328).

Almost surely, 2^20145505 is an apocalyptic number.

It is an amenable number.

20145505 is a deficient number, since it is larger than the sum of its proper divisors (4809119).

20145505 is a wasteful number, since it uses less digits than its factorization.

20145505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130007.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 20145505 is about 4488.3744273400. The cubic root of 20145505 is about 272.0984406158.

Adding to 20145505 its reverse (50554102), we get a palindrome (70699607).

The spelling of 20145505 in words is "twenty million, one hundred forty-five thousand, five hundred five".