20743479671 has 2 divisors, whose sum is σ = 20743479672. Its totient is φ = 20743479670.

The previous prime is 20743479667. The next prime is 20743479697. The reversal of 20743479671 is 17697434702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20743479671 - 2² = 20743479667 is a prime.

It is a super-2 number, since 2×20743479671² (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 (20743479661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371739835 + 10371739836.

It is an arithmetic number, because the mean of its divisors is an integer number (10371739836).

Almost surely, 2^20743479671 is an apocalyptic number.

20743479671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743479671 is an equidigital number, since it uses as much as digits as its factorization.

20743479671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 20743479671 in words is "twenty billion, seven hundred forty-three million, four hundred seventy-nine thousand, six hundred seventy-one".