20751124993 has 2 divisors, whose sum is σ = 20751124994. Its totient is φ = 20751124992.

The previous prime is 20751124969. The next prime is 20751125009. The reversal of 20751124993 is 39942115702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10467745344 + 10283379649 = 102312^2 + 101407^2 .

It is a cyclic number.

It is not a de Polignac number, because 20751124993 - 2⁹ = 20751124481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20751124963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10375562496 + 10375562497.

It is an arithmetic number, because the mean of its divisors is an integer number (10375562497).

Almost surely, 2^20751124993 is an apocalyptic number.

It is an amenable number.

20751124993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20751124993 is an equidigital number, since it uses as much as digits as its factorization.

20751124993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 20751124993 in words is "twenty billion, seven hundred fifty-one million, one hundred twenty-four thousand, nine hundred ninety-three".