20401122829 has 2 divisors, whose sum is σ = 20401122830. Its totient is φ = 20401122828.

The previous prime is 20401122827. The next prime is 20401122839. The reversal of 20401122829 is 92822110402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15949164100 + 4451958729 = 126290^2 + 66723^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401122829 - 2¹ = 20401122827 is a prime.

Together with 20401122827, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20401122829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401122823) 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, 10200561414 + 10200561415.

It is an arithmetic number, because the mean of its divisors is an integer number (10200561415).

Almost surely, 2^20401122829 is an apocalyptic number.

It is an amenable number.

20401122829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401122829 is an equidigital number, since it uses as much as digits as its factorization.

20401122829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 20401122829 in words is "twenty billion, four hundred one million, one hundred twenty-two thousand, eight hundred twenty-nine".