20147871749 has 2 divisors, whose sum is σ = 20147871750. Its totient is φ = 20147871748.

The previous prime is 20147871673. The next prime is 20147871761. The reversal of 20147871749 is 94717874102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20104404100 + 43467649 = 141790^2 + 6593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20147871749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20147871697 and 20147871706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20147871349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073935874 + 10073935875.

It is an arithmetic number, because the mean of its divisors is an integer number (10073935875).

Almost surely, 2^20147871749 is an apocalyptic number.

It is an amenable number.

20147871749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20147871749 is an equidigital number, since it uses as much as digits as its factorization.

20147871749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 20147871749 in words is "twenty billion, one hundred forty-seven million, eight hundred seventy-one thousand, seven hundred forty-nine".