20520135 has 24 divisors (see below), whose sum is σ = 36887760. Its totient is φ = 10943424.

The previous prime is 20520103. The next prime is 20520161. The reversal of 20520135 is 53102502.

It is a happy number.

It is not a de Polignac number, because 20520135 - 2⁵ = 20520103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7230 + ... + 9659.

It is an arithmetic number, because the mean of its divisors is an integer number (1536990).

Almost surely, 2^20520135 is an apocalyptic number.

20520135 is a deficient number, since it is larger than the sum of its proper divisors (16367625).

20520135 is an equidigital number, since it uses as much as digits as its factorization.

20520135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16909 (or 16897 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20520135 is about 4529.9155621270. The cubic root of 20520135 is about 273.7747585038.

Adding to 20520135 its reverse (53102502), we get a palindrome (73622637).

The spelling of 20520135 in words is "twenty million, five hundred twenty thousand, one hundred thirty-five".