20215255 has 16 divisors (see below), whose sum is σ = 25659648. Its totient is φ = 15264000.

The previous prime is 20215241. The next prime is 20215267. The reversal of 20215255 is 55251202.

It is not a de Polignac number, because 20215255 - 2⁹ = 20214743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4765 + ... + 7945.

It is an arithmetic number, because the mean of its divisors is an integer number (1603728).

Almost surely, 2^20215255 is an apocalyptic number.

20215255 is a deficient number, since it is larger than the sum of its proper divisors (5444393).

20215255 is a wasteful number, since it uses less digits than its factorization.

20215255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 20215255 is about 4496.1377870346. The cubic root of 20215255 is about 272.4121086804.

Adding to 20215255 its reverse (55251202), we get a palindrome (75466457).

The spelling of 20215255 in words is "twenty million, two hundred fifteen thousand, two hundred fifty-five".