20326139957 has 2 divisors, whose sum is σ = 20326139958. Its totient is φ = 20326139956.

The previous prime is 20326139927. The next prime is 20326140013. The reversal of 20326139957 is 75993162302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19973038276 + 353101681 = 141326^2 + 18791^2 .

It is a cyclic number.

It is not a de Polignac number, because 20326139957 - 2¹⁶ = 20326074421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20326139927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10163069978 + 10163069979.

It is an arithmetic number, because the mean of its divisors is an integer number (10163069979).

Almost surely, 2^20326139957 is an apocalyptic number.

It is an amenable number.

20326139957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20326139957 is an equidigital number, since it uses as much as digits as its factorization.

20326139957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 20326139957 in words is "twenty billion, three hundred twenty-six million, one hundred thirty-nine thousand, nine hundred fifty-seven".