20520005 has 8 divisors (see below), whose sum is σ = 26862624. Its totient is φ = 14923600.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520005 is 50002502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20520005 - 2¹² = 20515909 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 186491 + ... + 186600.

It is an arithmetic number, because the mean of its divisors is an integer number (3357828).

Almost surely, 2^20520005 is an apocalyptic number.

It is an amenable number.

20520005 is a deficient number, since it is larger than the sum of its proper divisors (6342619).

20520005 is a wasteful number, since it uses less digits than its factorization.

20520005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373107.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 20520005 is about 4529.9012130509. The cubic root of 20520005 is about 273.7741803596.

Adding to 20520005 its reverse (50002502), we get a palindrome (70522507).

It can be divided in two parts, 20 and 520005, that added together give a palindrome (520025).

The spelling of 20520005 in words is "twenty million, five hundred twenty thousand, five".