20025555 has 16 divisors (see below), whose sum is σ = 34953984. Its totient is φ = 9709280.

The previous prime is 20025527. The next prime is 20025559. The reversal of 20025555 is 55552002.

It is not a de Polignac number, because 20025555 - 2⁶ = 20025491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20025559) 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, 60519 + ... + 60848.

It is an arithmetic number, because the mean of its divisors is an integer number (2184624).

Almost surely, 2^20025555 is an apocalyptic number.

20025555 is a deficient number, since it is larger than the sum of its proper divisors (14928429).

20025555 is a wasteful number, since it uses less digits than its factorization.

20025555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121386.

The product of its (nonzero) digits is 2500, while the sum is 24.

The square root of 20025555 is about 4474.9921787641. The cubic root of 20025555 is about 271.5573240238.

Adding to 20025555 its reverse (55552002), we get a palindrome (75577557).

It can be divided in two parts, 2002 and 5555, that added together give a palindrome (7557).

The spelling of 20025555 in words is "twenty million, twenty-five thousand, five hundred fifty-five".