20145106 has 4 divisors (see below), whose sum is σ = 30217662. Its totient is φ = 10072552.

The previous prime is 20145089. The next prime is 20145107. The reversal of 20145106 is 60154102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60154102 = 2 ⋅30077051.

It can be written as a sum of positive squares in only one way, i.e., 10504081 + 9641025 = 3241^2 + 3105^2 .

It is not an unprimeable number, because it can be changed into a prime (20145107) 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 as a sum of consecutive naturals, namely, 5036275 + ... + 5036278.

Almost surely, 2^20145106 is an apocalyptic number.

20145106 is a deficient number, since it is larger than the sum of its proper divisors (10072556).

20145106 is a wasteful number, since it uses less digits than its factorization.

20145106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072555.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20145106 is about 4488.3299789565. The cubic root of 20145106 is about 272.0966442184.

Adding to 20145106 its reverse (60154102), we get a palindrome (80299208).

The spelling of 20145106 in words is "twenty million, one hundred forty-five thousand, one hundred six".