20506266437 has 2 divisors, whose sum is σ = 20506266438. Its totient is φ = 20506266436.

The previous prime is 20506266419. The next prime is 20506266461. The reversal of 20506266437 is 73466260502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263774436 + 1242492001 = 138794^2 + 35249^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506266437 - 2¹² = 20506262341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20506266394 and 20506266403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20506266637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253133218 + 10253133219.

It is an arithmetic number, because the mean of its divisors is an integer number (10253133219).

Almost surely, 2^20506266437 is an apocalyptic number.

It is an amenable number.

20506266437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506266437 is an equidigital number, since it uses as much as digits as its factorization.

20506266437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 41.

The spelling of 20506266437 in words is "twenty billion, five hundred six million, two hundred sixty-six thousand, four hundred thirty-seven".