20507370749 has 2 divisors, whose sum is σ = 20507370750. Its totient is φ = 20507370748.

The previous prime is 20507370713. The next prime is 20507370809. The reversal of 20507370749 is 94707370502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20223684100 + 283686649 = 142210^2 + 16843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507370749 - 2¹⁶ = 20507305213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20507372749) 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, 10253685374 + 10253685375.

It is an arithmetic number, because the mean of its divisors is an integer number (10253685375).

Almost surely, 2^20507370749 is an apocalyptic number.

It is an amenable number.

20507370749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507370749 is an equidigital number, since it uses as much as digits as its factorization.

20507370749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 20507370749 in words is "twenty billion, five hundred seven million, three hundred seventy thousand, seven hundred forty-nine".