20000555 has 8 divisors (see below), whose sum is σ = 24058944. Its totient is φ = 15961600.

The previous prime is 20000543. The next prime is 20000567. The reversal of 20000555 is 55500002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20000543) and next prime (20000567).

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

It is a de Polignac number, because none of the positive numbers 2^k-20000555 is a prime.

It is a Duffinian number.

20000555 is a modest number, since divided by 555 gives 20 as remainder.

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 7 ways as a sum of consecutive naturals, for example, 2486 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (3007368).

Almost surely, 2^20000555 is an apocalyptic number.

20000555 is a deficient number, since it is larger than the sum of its proper divisors (4058389).

20000555 is an equidigital number, since it uses as much as digits as its factorization.

20000555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9717.

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 20000555 is about 4472.1980054555. The cubic root of 20000555 is about 271.4442724726. Note that the first 3 decimals are identical.

Adding to 20000555 its reverse (55500002), we get a palindrome (75500557).

The spelling of 20000555 in words is "twenty million, five hundred fifty-five", and thus it is an aban number.