20453505 has 16 divisors (see below), whose sum is σ = 33175680. Its totient is φ = 10758528.

The previous prime is 20453501. The next prime is 20453527. The reversal of 20453505 is 50535402.

It is not a de Polignac number, because 20453505 - 2² = 20453501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20453501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8245 + ... + 10434.

It is an arithmetic number, because the mean of its divisors is an integer number (2073480).

Almost surely, 2^20453505 is an apocalyptic number.

It is an amenable number.

20453505 is a deficient number, since it is larger than the sum of its proper divisors (12722175).

20453505 is a wasteful number, since it uses less digits than its factorization.

20453505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18760.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20453505 is about 4522.5551406257. Note that the first 3 decimals coincide. The cubic root of 20453505 is about 273.4781166658.

Adding to 20453505 its reverse (50535402), we get a palindrome (70988907).

The spelling of 20453505 in words is "twenty million, four hundred fifty-three thousand, five hundred five".