20331999943 has 2 divisors, whose sum is σ = 20331999944. Its totient is φ = 20331999942.

The previous prime is 20331999911. The next prime is 20332000019. The reversal of 20331999943 is 34999913302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331999943 - 2⁵ = 20331999911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331969943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165999971 + 10165999972.

It is an arithmetic number, because the mean of its divisors is an integer number (10165999972).

Almost surely, 2^20331999943 is an apocalyptic number.

20331999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331999943 is an equidigital number, since it uses as much as digits as its factorization.

20331999943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1417176, while the sum is 52.

The spelling of 20331999943 in words is "twenty billion, three hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred forty-three".