20429703902081 has 2 divisors, whose sum is σ = 20429703902082. Its totient is φ = 20429703902080.

The previous prime is 20429703902059. The next prime is 20429703902117. The reversal of 20429703902081 is 18020930792402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10472239655056 + 9957464247025 = 3236084^2 + 3155545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20429703902081 - 2⁶ = 20429703902017 is a prime.

It is a super-2 number, since 2×20429703902081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20429703902011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214851951040 + 10214851951041.

It is an arithmetic number, because the mean of its divisors is an integer number (10214851951041).

Almost surely, 2^{20429703902081} is an apocalyptic number.

It is an amenable number.

20429703902081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20429703902081 is an equidigital number, since it uses as much as digits as its factorization.

20429703902081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 20429703902081 in words is "twenty trillion, four hundred twenty-nine billion, seven hundred three million, nine hundred two thousand, eighty-one".