20520331 has 8 divisors (see below), whose sum is σ = 22613360. Its totient is φ = 18500832.

The previous prime is 20520319. The next prime is 20520337. The reversal of 20520331 is 13302502.

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

It is a cyclic number.

It is not a de Polignac number, because 20520331 - 2⁵ = 20520299 is a prime.

It is a super-2 number, since 2×20520331² = 842167968699122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520337) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17796 + ... + 18913.

It is an arithmetic number, because the mean of its divisors is an integer number (2826670).

Almost surely, 2^20520331 is an apocalyptic number.

20520331 is a deficient number, since it is larger than the sum of its proper divisors (2093029).

20520331 is a wasteful number, since it uses less digits than its factorization.

20520331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36765.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20520331 is about 4529.9371960326. The cubic root of 20520331 is about 273.7756301628.

Adding to 20520331 its reverse (13302502), we get a palindrome (33822833).

The spelling of 20520331 in words is "twenty million, five hundred twenty thousand, three hundred thirty-one".