20320455 has 16 divisors (see below), whose sum is σ = 32569344. Its totient is φ = 10818720.

The previous prime is 20320453. The next prime is 20320463. The reversal of 20320455 is 55402302.

It is not a de Polignac number, because 20320455 - 2¹ = 20320453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14182 + ... + 15548.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^20320455 is an apocalyptic number.

20320455 is a deficient number, since it is larger than the sum of its proper divisors (12248889).

20320455 is a wasteful number, since it uses less digits than its factorization.

20320455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20320455 is about 4507.8215359528. The cubic root of 20320455 is about 272.8838347027.

Adding to 20320455 its reverse (55402302), we get a palindrome (75722757).

The spelling of 20320455 in words is "twenty million, three hundred twenty thousand, four hundred fifty-five".