20012120957 has 2 divisors, whose sum is σ = 20012120958. Its totient is φ = 20012120956.

The previous prime is 20012120893. The next prime is 20012120963. The reversal of 20012120957 is 75902121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16896360196 + 3115760761 = 129986^2 + 55819^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012120957 - 2⁶ = 20012120893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012120257) 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, 10006060478 + 10006060479.

It is an arithmetic number, because the mean of its divisors is an integer number (10006060479).

Almost surely, 2^20012120957 is an apocalyptic number.

It is an amenable number.

20012120957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012120957 is an equidigital number, since it uses as much as digits as its factorization.

20012120957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 20012120957 its reverse (75902121002), we get a palindrome (95914241959).

The spelling of 20012120957 in words is "twenty billion, twelve million, one hundred twenty thousand, nine hundred fifty-seven".