20312321377 has 2 divisors, whose sum is σ = 20312321378. Its totient is φ = 20312321376.

The previous prime is 20312321371. The next prime is 20312321387. The reversal of 20312321377 is 77312321302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20108374416 + 203946961 = 141804^2 + 14281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312321377 is a prime.

It is a super-2 number, since 2×20312321377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20312321371) 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, 10156160688 + 10156160689.

It is an arithmetic number, because the mean of its divisors is an integer number (10156160689).

Almost surely, 2^20312321377 is an apocalyptic number.

It is an amenable number.

20312321377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312321377 is an equidigital number, since it uses as much as digits as its factorization.

20312321377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 31.

Adding to 20312321377 its reverse (77312321302), we get a palindrome (97624642679).

The spelling of 20312321377 in words is "twenty billion, three hundred twelve million, three hundred twenty-one thousand, three hundred seventy-seven".