20349986881823 has 2 divisors, whose sum is σ = 20349986881824. Its totient is φ = 20349986881822.

The previous prime is 20349986881811. The next prime is 20349986881927. The reversal of 20349986881823 is 32818868994302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20349986881823 - 2¹⁶ = 20349986816287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20349986889823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174993440911 + 10174993440912.

It is an arithmetic number, because the mean of its divisors is an integer number (10174993440912).

Almost surely, 2^{20349986881823} is an apocalyptic number.

20349986881823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349986881823 is an equidigital number, since it uses as much as digits as its factorization.

20349986881823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 286654464, while the sum is 71.

The spelling of 20349986881823 in words is "twenty trillion, three hundred forty-nine billion, nine hundred eighty-six million, eight hundred eighty-one thousand, eight hundred twenty-three".