20531630233 has 2 divisors, whose sum is σ = 20531630234. Its totient is φ = 20531630232.

The previous prime is 20531630213. The next prime is 20531630321. The reversal of 20531630233 is 33203613502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13426320384 + 7105309849 = 115872^2 + 84293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531630233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531630213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265815116 + 10265815117.

It is an arithmetic number, because the mean of its divisors is an integer number (10265815117).

Almost surely, 2^20531630233 is an apocalyptic number.

It is an amenable number.

20531630233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531630233 is an equidigital number, since it uses as much as digits as its factorization.

20531630233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 28.

The spelling of 20531630233 in words is "twenty billion, five hundred thirty-one million, six hundred thirty thousand, two hundred thirty-three".