20330440957 has 2 divisors, whose sum is σ = 20330440958. Its totient is φ = 20330440956.

The previous prime is 20330440951. The next prime is 20330440961. The reversal of 20330440957 is 75904403302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20185021476 + 145419481 = 142074^2 + 12059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330440957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20330440951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165220478 + 10165220479.

It is an arithmetic number, because the mean of its divisors is an integer number (10165220479).

Almost surely, 2^20330440957 is an apocalyptic number.

It is an amenable number.

20330440957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330440957 is an equidigital number, since it uses as much as digits as its factorization.

20330440957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 20330440957 in words is "twenty billion, three hundred thirty million, four hundred forty thousand, nine hundred fifty-seven".