20533303331 has 2 divisors, whose sum is σ = 20533303332. Its totient is φ = 20533303330.

The previous prime is 20533303327. The next prime is 20533303367. The reversal of 20533303331 is 13330333502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20533303331 - 2² = 20533303327 is a prime.

It is a super-2 number, since 2×20533303331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20533303331.

It is not a weakly prime, because it can be changed into another prime (20533303031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266651665 + 10266651666.

It is an arithmetic number, because the mean of its divisors is an integer number (10266651666).

Almost surely, 2^20533303331 is an apocalyptic number.

20533303331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533303331 is an equidigital number, since it uses as much as digits as its factorization.

20533303331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 26.

Adding to 20533303331 its reverse (13330333502), we get a palindrome (33863636833).

The spelling of 20533303331 in words is "twenty billion, five hundred thirty-three million, three hundred three thousand, three hundred thirty-one".