20109748957 has 2 divisors, whose sum is σ = 20109748958. Its totient is φ = 20109748956.

The previous prime is 20109748933. The next prime is 20109749059. The reversal of 20109748957 is 75984790102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14320669561 + 5789079396 = 119669^2 + 76086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20109748957 - 2¹⁹ = 20109224669 is a prime.

It is a super-2 number, since 2×20109748957² (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 (20109748927) 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, 10054874478 + 10054874479.

It is an arithmetic number, because the mean of its divisors is an integer number (10054874479).

Almost surely, 2^20109748957 is an apocalyptic number.

It is an amenable number.

20109748957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109748957 is an equidigital number, since it uses as much as digits as its factorization.

20109748957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 20109748957 in words is "twenty billion, one hundred nine million, seven hundred forty-eight thousand, nine hundred fifty-seven".