20810145 has 16 divisors (see below), whose sum is σ = 34371072. Its totient is φ = 10740480.

The previous prime is 20810129. The next prime is 20810177. The reversal of 20810145 is 54101802.

It is not a de Polignac number, because 20810145 - 2⁴ = 20810129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21912 + ... + 22841.

It is an arithmetic number, because the mean of its divisors is an integer number (2148192).

Almost surely, 2^20810145 is an apocalyptic number.

It is an amenable number.

20810145 is a deficient number, since it is larger than the sum of its proper divisors (13560927).

20810145 is a wasteful number, since it uses less digits than its factorization.

20810145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44792.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20810145 is about 4561.8137840118. The cubic root of 20810145 is about 275.0584779221.

Adding to 20810145 its reverse (54101802), we get a palindrome (74911947).

The spelling of 20810145 in words is "twenty million, eight hundred ten thousand, one hundred forty-five".