20151255 has 16 divisors (see below), whose sum is σ = 32724864. Its totient is φ = 10586400.

The previous prime is 20151251. The next prime is 20151277. The reversal of 20151255 is 55215102.

It is not a de Polignac number, because 20151255 - 2² = 20151251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9021 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (2045304).

Almost surely, 2^20151255 is an apocalyptic number.

20151255 is a deficient number, since it is larger than the sum of its proper divisors (12573609).

20151255 is a wasteful number, since it uses less digits than its factorization.

20151255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20126.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 20151255 is about 4489.0149253483. The cubic root of 20151255 is about 272.1243259138.

Adding to 20151255 its reverse (55215102), we get a palindrome (75366357).

The spelling of 20151255 in words is "twenty million, one hundred fifty-one thousand, two hundred fifty-five".