20120145 has 32 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 10088640.

The previous prime is 20120143. The next prime is 20120153. The reversal of 20120145 is 54102102.

It is not a de Polignac number, because 20120145 - 2¹ = 20120143 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20120143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64540 + ... + 64850.

It is an arithmetic number, because the mean of its divisors is an integer number (1067040).

Almost surely, 2^20120145 is an apocalyptic number.

It is an amenable number.

20120145 is a deficient number, since it is larger than the sum of its proper divisors (14025135).

20120145 is a wasteful number, since it uses less digits than its factorization.

20120145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565.

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

The square root of 20120145 is about 4485.5484614482. The cubic root of 20120145 is about 271.9842163924.

Adding to 20120145 its reverse (54102102), we get a palindrome (74222247).

The spelling of 20120145 in words is "twenty million, one hundred twenty thousand, one hundred forty-five".