20331333331 has 2 divisors, whose sum is σ = 20331333332. Its totient is φ = 20331333330.

The previous prime is 20331333307. The next prime is 20331333349. The reversal of 20331333331 is 13333313302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20331333331 - 2⁷ = 20331333203 is a prime.

It is a super-2 number, since 2×20331333331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20331333296 and 20331333305.

It is not a weakly prime, because it can be changed into another prime (20331333371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165666665 + 10165666666.

It is an arithmetic number, because the mean of its divisors is an integer number (10165666666).

Almost surely, 2^20331333331 is an apocalyptic number.

20331333331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331333331 is an equidigital number, since it uses as much as digits as its factorization.

20331333331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 25.

Adding to 20331333331 its reverse (13333313302), we get a palindrome (33664646633).

The spelling of 20331333331 in words is "twenty billion, three hundred thirty-one million, three hundred thirty-three thousand, three hundred thirty-one".