20072145 has 16 divisors (see below), whose sum is σ = 32176512. Its totient is φ = 10684800.

The previous prime is 20072141. The next prime is 20072161. The reversal of 20072145 is 54127002.

It is not a de Polignac number, because 20072145 - 2² = 20072141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20072141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10245 + ... + 12045.

It is an arithmetic number, because the mean of its divisors is an integer number (2011032).

Almost surely, 2^20072145 is an apocalyptic number.

It is an amenable number.

20072145 is a deficient number, since it is larger than the sum of its proper divisors (12104367).

20072145 is a wasteful number, since it uses less digits than its factorization.

20072145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20072145 is about 4480.1947502313. The cubic root of 20072145 is about 271.7677560903.

Adding to 20072145 its reverse (54127002), we get a palindrome (74199147).

The spelling of 20072145 in words is "twenty million, seventy-two thousand, one hundred forty-five".