20958005437 has 2 divisors, whose sum is σ = 20958005438. Its totient is φ = 20958005436.

The previous prime is 20958005377. The next prime is 20958005449. The reversal of 20958005437 is 73450085902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11250632761 + 9707372676 = 106069^2 + 98526^2 .

It is a cyclic number.

It is not a de Polignac number, because 20958005437 - 2²³ = 20949616829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20958005393 and 20958005402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20958005837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479002718 + 10479002719.

It is an arithmetic number, because the mean of its divisors is an integer number (10479002719).

Almost surely, 2^20958005437 is an apocalyptic number.

It is an amenable number.

20958005437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958005437 is an equidigital number, since it uses as much as digits as its factorization.

20958005437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 20958005437 in words is "twenty billion, nine hundred fifty-eight million, five thousand, four hundred thirty-seven".