20500555 has 8 divisors (see below), whose sum is σ = 26047872. Its totient is φ = 15435648.

The previous prime is 20500541. The next prime is 20500577. The reversal of 20500555 is 55500502.

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

It is a cyclic number.

It is not a de Polignac number, because 20500555 - 2⁵ = 20500523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120507 + ... + 120676.

It is an arithmetic number, because the mean of its divisors is an integer number (3255984).

Almost surely, 2^20500555 is an apocalyptic number.

20500555 is a deficient number, since it is larger than the sum of its proper divisors (5547317).

20500555 is a wasteful number, since it uses less digits than its factorization.

20500555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241205.

The product of its (nonzero) digits is 1250, while the sum is 22.

The square root of 20500555 is about 4527.7538581509. The cubic root of 20500555 is about 273.6876535595.

The spelling of 20500555 in words is "twenty million, five hundred thousand, five hundred fifty-five".