20170055 has 4 divisors (see below), whose sum is σ = 24204072. Its totient is φ = 16136040.

The previous prime is 20170049. The next prime is 20170061. The reversal of 20170055 is 55007102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55007102 = 2 ⋅27503551.

It is an interprime number because it is at equal distance from previous prime (20170049) and next prime (20170061).

It is a de Polignac number, because none of the positive numbers 2^k-20170055 is a prime.

It is a super-2 number, since 2×20170055² = 813662237406050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2017001 + ... + 2017010.

It is an arithmetic number, because the mean of its divisors is an integer number (6051018).

Almost surely, 2^20170055 is an apocalyptic number.

20170055 is a deficient number, since it is larger than the sum of its proper divisors (4034017).

20170055 is an equidigital number, since it uses as much as digits as its factorization.

20170055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034016.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20170055 is about 4491.1084377913. The cubic root of 20170055 is about 272.2089252302.

Adding to 20170055 its reverse (55007102), we get a palindrome (75177157).

The spelling of 20170055 in words is "twenty million, one hundred seventy thousand, fifty-five".