20523331 has 8 divisors (see below), whose sum is σ = 21081600. Its totient is φ = 19972680.

The previous prime is 20523323. The next prime is 20523343. The reversal of 20523331 is 13332502.

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 20523331 - 2³ = 20523323 is a prime.

It is a super-2 number, since 2×20523331² = 842414230671122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20523299 and 20523308.

It is not an unprimeable number, because it can be changed into a prime (20523361) by changing a digit.

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, 3780 + ... + 7438.

It is an arithmetic number, because the mean of its divisors is an integer number (2635200).

Almost surely, 2^20523331 is an apocalyptic number.

20523331 is a deficient number, since it is larger than the sum of its proper divisors (558269).

20523331 is an equidigital number, since it uses as much as digits as its factorization.

20523331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3809.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20523331 is about 4530.2683143496. The cubic root of 20523331 is about 273.7889711898.

Adding to 20523331 its reverse (13332502), we get a palindrome (33855833).

The spelling of 20523331 in words is "twenty million, five hundred twenty-three thousand, three hundred thirty-one".