20001019904069 has 2 divisors, whose sum is σ = 20001019904070. Its totient is φ = 20001019904068.

The previous prime is 20001019904009. The next prime is 20001019904083. The reversal of 20001019904069 is 96040991010002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17178828220225 + 2822191683844 = 4144735^2 + 1679938^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001019904069 - 2⁴⁰ = 18901508276293 is a prime.

It is a super-2 number, since 2×20001019904069² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001019904009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000509952034 + 10000509952035.

It is an arithmetic number, because the mean of its divisors is an integer number (10000509952035).

Almost surely, 2^{20001019904069} is an apocalyptic number.

It is an amenable number.

20001019904069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001019904069 is an equidigital number, since it uses as much as digits as its factorization.

20001019904069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 20001019904069 in words is "twenty trillion, one billion, nineteen million, nine hundred four thousand, sixty-nine".