20120045 has 16 divisors (see below), whose sum is σ = 27053568. Its totient is φ = 14235840.

The previous prime is 20120029. The next prime is 20120047. The reversal of 20120045 is 54002102.

It is not a de Polignac number, because 20120045 - 2⁴ = 20120029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2909 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (1690848).

Almost surely, 2^20120045 is an apocalyptic number.

It is an amenable number.

20120045 is a deficient number, since it is larger than the sum of its proper divisors (6933523).

20120045 is a wasteful number, since it uses less digits than its factorization.

20120045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9940.

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

The square root of 20120045 is about 4485.5373145254. The cubic root of 20120045 is about 271.9837657915.

Adding to 20120045 its reverse (54002102), we get a palindrome (74122147).

The spelling of 20120045 in words is "twenty million, one hundred twenty thousand, forty-five".