20001255 has 8 divisors (see below), whose sum is σ = 32002032. Its totient is φ = 10667328.

The previous prime is 20001253. The next prime is 20001259. The reversal of 20001255 is 55210002.

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

It is not a de Polignac number, because 20001255 - 2¹ = 20001253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 1333417 = 20001255 / (2 + 0 + 0 + 0 + 1 + 2 + 5 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001253) by changing a digit.

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, 666694 + ... + 666723.

It is an arithmetic number, because the mean of its divisors is an integer number (4000254).

Almost surely, 2^20001255 is an apocalyptic number.

20001255 is a deficient number, since it is larger than the sum of its proper divisors (12000777).

20001255 is a wasteful number, since it uses less digits than its factorization.

20001255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333425.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 20001255 is about 4472.2762660641. The cubic root of 20001255 is about 271.4474391976.

Adding to 20001255 its reverse (55210002), we get a palindrome (75211257).

The spelling of 20001255 in words is "twenty million, one thousand, two hundred fifty-five".