20450555 has 16 divisors (see below), whose sum is σ = 26263200. Its totient is φ = 15240960.

The previous prime is 20450543. The next prime is 20450567. The reversal of 20450555 is 55505402.

It is an interprime number because it is at equal distance from previous prime (20450543) and next prime (20450567).

It is not a de Polignac number, because 20450555 - 2⁶ = 20450491 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4031 + ... + 7559.

It is an arithmetic number, because the mean of its divisors is an integer number (1641450).

Almost surely, 2^20450555 is an apocalyptic number.

20450555 is a deficient number, since it is larger than the sum of its proper divisors (5812645).

20450555 is a wasteful number, since it uses less digits than its factorization.

20450555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 20450555 is about 4522.2289857989. The cubic root of 20450555 is about 273.4649681576.

Adding to 20450555 its reverse (55505402), we get a palindrome (75955957).

The spelling of 20450555 in words is "twenty million, four hundred fifty thousand, five hundred fifty-five".