20311133233 has 2 divisors, whose sum is σ = 20311133234. Its totient is φ = 20311133232.

The previous prime is 20311133221. The next prime is 20311133243. The reversal of 20311133233 is 33233111302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15350466609 + 4960666624 = 123897^2 + 70432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311133233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20311133243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155566616 + 10155566617.

It is an arithmetic number, because the mean of its divisors is an integer number (10155566617).

Almost surely, 2^20311133233 is an apocalyptic number.

It is an amenable number.

20311133233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311133233 is an equidigital number, since it uses as much as digits as its factorization.

20311133233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 20311133233 its reverse (33233111302), we get a palindrome (53544244535).

The spelling of 20311133233 in words is "twenty billion, three hundred eleven million, one hundred thirty-three thousand, two hundred thirty-three".