20907145 has 16 divisors (see below), whose sum is σ = 28748160. Its totient is φ = 14298624.

The previous prime is 20907137. The next prime is 20907167. The reversal of 20907145 is 54170902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20907145 - 2³ = 20907137 is a prime.

It is an unprimeable number.

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, 22041 + ... + 22969.

It is an arithmetic number, because the mean of its divisors is an integer number (1796760).

Almost surely, 2^20907145 is an apocalyptic number.

It is an amenable number.

20907145 is a deficient number, since it is larger than the sum of its proper divisors (7841015).

20907145 is an equidigital number, since it uses as much as digits as its factorization.

20907145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20907145 is about 4572.4331597083. The cubic root of 20907145 is about 275.4851820582.

The spelling of 20907145 in words is "twenty million, nine hundred seven thousand, one hundred forty-five".