20513146 has 16 divisors (see below), whose sum is σ = 31501800. Its totient is φ = 10015488.

The previous prime is 20513113. The next prime is 20513177. The reversal of 20513146 is 64131502.

It can be written as a sum of positive squares in 4 ways, for example, as 20349121 + 164025 = 4511^2 + 405^2 .

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 7 ways as a sum of consecutive naturals, for example, 15270 + ... + 16558.

Almost surely, 2^20513146 is an apocalyptic number.

20513146 is a deficient number, since it is larger than the sum of its proper divisors (10988654).

20513146 is a wasteful number, since it uses less digits than its factorization.

20513146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20513146 is about 4529.1440692475. The cubic root of 20513146 is about 273.7436731161.

Adding to 20513146 its reverse (64131502), we get a palindrome (84644648).

The spelling of 20513146 in words is "twenty million, five hundred thirteen thousand, one hundred forty-six".