20494672729 has 2 divisors, whose sum is σ = 20494672730. Its totient is φ = 20494672728.

The previous prime is 20494672703. The next prime is 20494672741. The reversal of 20494672729 is 92727649402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10660975504 + 9833697225 = 103252^2 + 99165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20494672729 - 2⁹ = 20494672217 is a prime.

It is a super-2 number, since 2×20494672729² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20494172729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247336364 + 10247336365.

It is an arithmetic number, because the mean of its divisors is an integer number (10247336365).

Almost surely, 2^20494672729 is an apocalyptic number.

It is an amenable number.

20494672729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494672729 is an equidigital number, since it uses as much as digits as its factorization.

20494672729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 52.

The spelling of 20494672729 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-two thousand, seven hundred twenty-nine".