20237870561 has 2 divisors, whose sum is σ = 20237870562. Its totient is φ = 20237870560.

The previous prime is 20237870557. The next prime is 20237870563. The reversal of 20237870561 is 16507873202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14829150625 + 5408719936 = 121775^2 + 73544^2 .

It is a cyclic number.

It is not a de Polignac number, because 20237870561 - 2² = 20237870557 is a prime.

Together with 20237870563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20237870563) 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, 10118935280 + 10118935281.

It is an arithmetic number, because the mean of its divisors is an integer number (10118935281).

Almost surely, 2^20237870561 is an apocalyptic number.

It is an amenable number.

20237870561 is a deficient number, since it is larger than the sum of its proper divisors (1).

20237870561 is an equidigital number, since it uses as much as digits as its factorization.

20237870561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 20237870561 in words is "twenty billion, two hundred thirty-seven million, eight hundred seventy thousand, five hundred sixty-one".