20213331 has 4 divisors (see below), whose sum is σ = 26951112. Its totient is φ = 13475552.

The previous prime is 20213317. The next prime is 20213351. The reversal of 20213331 is 13331202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20213331 - 2⁶ = 20213267 is a prime.

It is a super-2 number, since 2×20213331² = 817157500231122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20213331.

It is not an unprimeable number, because it can be changed into a prime (20213351) 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 3 ways as a sum of consecutive naturals, for example, 3368886 + ... + 3368891.

It is an arithmetic number, because the mean of its divisors is an integer number (6737778).

Almost surely, 2^20213331 is an apocalyptic number.

20213331 is a deficient number, since it is larger than the sum of its proper divisors (6737781).

20213331 is an equidigital number, since it uses as much as digits as its factorization.

20213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737780.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20213331 is about 4495.9238205290. The cubic root of 20213331 is about 272.4034660731.

Adding to 20213331 its reverse (13331202), we get a palindrome (33544533).

The spelling of 20213331 in words is "twenty million, two hundred thirteen thousand, three hundred thirty-one".