20604020669 has 2 divisors, whose sum is σ = 20604020670. Its totient is φ = 20604020668.

The previous prime is 20604020639. The next prime is 20604020681. The reversal of 20604020669 is 96602040602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120111225 + 4483909444 = 126965^2 + 66962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604020669 - 2¹⁶ = 20603955133 is a prime.

It is a super-2 number, since 2×20604020669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20604020639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302010334 + 10302010335.

It is an arithmetic number, because the mean of its divisors is an integer number (10302010335).

Almost surely, 2^20604020669 is an apocalyptic number.

It is an amenable number.

20604020669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604020669 is an equidigital number, since it uses as much as digits as its factorization.

20604020669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 20604020669 in words is "twenty billion, six hundred four million, twenty thousand, six hundred sixty-nine".