20551167 has 48 divisors (see below), whose sum is σ = 38158848. Its totient is φ = 10359360.

The previous prime is 20551159. The next prime is 20551183. The reversal of 20551167 is 76115502.

It is not a de Polignac number, because 20551167 - 2³ = 20551159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20551167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551067) 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 47 ways as a sum of consecutive naturals, for example, 18292 + ... + 19382.

It is an arithmetic number, because the mean of its divisors is an integer number (794976).

Almost surely, 2^20551167 is an apocalyptic number.

20551167 is a deficient number, since it is larger than the sum of its proper divisors (17607681).

20551167 is a wasteful number, since it uses less digits than its factorization.

20551167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 1137 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 20551167 is about 4533.3394975448. The cubic root of 20551167 is about 273.9126961808.

Adding to 20551167 its reverse (76115502), we get a palindrome (96666669).

The spelling of 20551167 in words is "twenty million, five hundred fifty-one thousand, one hundred sixty-seven".