20020145 has 8 divisors (see below), whose sum is σ = 24673704. Its totient is φ = 15583104.

The previous prime is 20020109. The next prime is 20020151. The reversal of 20020145 is 54102002.

It can be written as a sum of positive squares in 4 ways, for example, as 2572816 + 17447329 = 1604^2 + 4177^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20020145 - 2¹⁰ = 20019121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53924 + ... + 54293.

It is an arithmetic number, because the mean of its divisors is an integer number (3084213).

Almost surely, 2^20020145 is an apocalyptic number.

It is an amenable number.

20020145 is a deficient number, since it is larger than the sum of its proper divisors (4653559).

20020145 is a wasteful number, since it uses less digits than its factorization.

20020145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108259.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20020145 is about 4474.3876676032. The cubic root of 20020145 is about 271.5328676490.

Adding to 20020145 its reverse (54102002), we get a palindrome (74122147).

The spelling of 20020145 in words is "twenty million, twenty thousand, one hundred forty-five".