20330555 has 32 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 12824064.

The previous prime is 20330549. The next prime is 20330567. The reversal of 20330555 is 55503302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20330555 - 2⁴ = 20330539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20330555.

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 31 ways as a sum of consecutive naturals, for example, 27602 + ... + 28328.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^20330555 is an apocalyptic number.

20330555 is a deficient number, since it is larger than the sum of its proper divisors (9861061).

20330555 is a wasteful number, since it uses less digits than its factorization.

20330555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20330555 is about 4508.9416718339. The cubic root of 20330555 is about 272.9290382546.

Adding to 20330555 its reverse (55503302), we get a palindrome (75833857).

The spelling of 20330555 in words is "twenty million, three hundred thirty thousand, five hundred fifty-five".