20648145 has 32 divisors (see below), whose sum is σ = 39064320. Its totient is φ = 9112320.

The previous prime is 20648143. The next prime is 20648153. The reversal of 20648145 is 54184602.

It is not a de Polignac number, because 20648145 - 2¹ = 20648143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20648141) 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 31 ways as a sum of consecutive naturals, for example, 346 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (1220760).

Almost surely, 2^20648145 is an apocalyptic number.

It is an amenable number.

20648145 is a deficient number, since it is larger than the sum of its proper divisors (18416175).

20648145 is a wasteful number, since it uses less digits than its factorization.

20648145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20648145 is about 4544.0229973010. The cubic root of 20648145 is about 274.3428717766.

The spelling of 20648145 in words is "twenty million, six hundred forty-eight thousand, one hundred forty-five".