20145512 has 16 divisors (see below), whose sum is σ = 38486340. Its totient is φ = 9882496.

The previous prime is 20145509. The next prime is 20145547. The reversal of 20145512 is 21554102.

It can be written as a sum of positive squares in 2 ways, for example, as 20124196 + 21316 = 4486^2 + 146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23333 + ... + 24180.

Almost surely, 2^20145512 is an apocalyptic number.

It is an amenable number.

20145512 is a deficient number, since it is larger than the sum of its proper divisors (18340828).

20145512 is a wasteful number, since it uses less digits than its factorization.

20145512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47572 (or 47568 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20145512 is about 4488.3752071323. The cubic root of 20145512 is about 272.0984721313.

Adding to 20145512 its reverse (21554102), we get a palindrome (41699614).

The spelling of 20145512 in words is "twenty million, one hundred forty-five thousand, five hundred twelve".