20012145 has 16 divisors (see below), whose sum is σ = 33903360. Its totient is φ = 10045184.

The previous prime is 20012119. The next prime is 20012171. The reversal of 20012145 is 54121002.

It is an interprime number because it is at equal distance from previous prime (20012119) and next prime (20012171).

It is a cyclic number.

It is not a de Polignac number, because 20012145 - 2¹² = 20008049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38985 + ... + 39494.

It is an arithmetic number, because the mean of its divisors is an integer number (2118960).

Almost surely, 2^20012145 is an apocalyptic number.

It is an amenable number.

20012145 is a deficient number, since it is larger than the sum of its proper divisors (13891215).

20012145 is a wasteful number, since it uses less digits than its factorization.

20012145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78504.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20012145 is about 4473.4936012025. The cubic root of 20012145 is about 271.4966948782.

Adding to 20012145 its reverse (54121002), we get a palindrome (74133147).

The spelling of 20012145 in words is "twenty million, twelve thousand, one hundred forty-five".