20858655437 has 2 divisors, whose sum is σ = 20858655438. Its totient is φ = 20858655436.

The previous prime is 20858655371. The next prime is 20858655469. The reversal of 20858655437 is 73455685802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19665574756 + 1193080681 = 140234^2 + 34541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20858655437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20858657437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429327718 + 10429327719.

It is an arithmetic number, because the mean of its divisors is an integer number (10429327719).

Almost surely, 2^20858655437 is an apocalyptic number.

It is an amenable number.

20858655437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858655437 is an equidigital number, since it uses as much as digits as its factorization.

20858655437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 20858655437 in words is "twenty billion, eight hundred fifty-eight million, six hundred fifty-five thousand, four hundred thirty-seven".