20949297793069 has 2 divisors, whose sum is σ = 20949297793070. Its totient is φ = 20949297793068.

The previous prime is 20949297793051. The next prime is 20949297793133. The reversal of 20949297793069 is 96039779294902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18396850614025 + 2552447179044 = 4289155^2 + 1597638^2 .

It is a cyclic number.

It is not a de Polignac number, because 20949297793069 - 2¹¹ = 20949297791021 is a prime.

It is a super-2 number, since 2×20949297793069² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20949297792986 and 20949297793004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20949297793009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474648896534 + 10474648896535.

It is an arithmetic number, because the mean of its divisors is an integer number (10474648896535).

Almost surely, 2^{20949297793069} is an apocalyptic number.

It is an amenable number.

20949297793069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949297793069 is an equidigital number, since it uses as much as digits as its factorization.

20949297793069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 833299488, while the sum is 76.

The spelling of 20949297793069 in words is "twenty trillion, nine hundred forty-nine billion, two hundred ninety-seven million, seven hundred ninety-three thousand, sixty-nine".