20310998381 has 2 divisors, whose sum is σ = 20310998382. Its totient is φ = 20310998380.

The previous prime is 20310998369. The next prime is 20310998459. The reversal of 20310998381 is 18389901302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19107532900 + 1203465481 = 138230^2 + 34691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310998381 is a prime.

It is a super-2 number, since 2×20310998381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310998311) 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, 10155499190 + 10155499191.

It is an arithmetic number, because the mean of its divisors is an integer number (10155499191).

Almost surely, 2^20310998381 is an apocalyptic number.

It is an amenable number.

20310998381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310998381 is an equidigital number, since it uses as much as digits as its factorization.

20310998381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 20310998381 in words is "twenty billion, three hundred ten million, nine hundred ninety-eight thousand, three hundred eighty-one".