20704529 has 2 divisors, whose sum is σ = 20704530. Its totient is φ = 20704528.

The previous prime is 20704517. The next prime is 20704561. The reversal of 20704529 is 92540702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 5650129 = 3880^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 20704529 - 2⁴ = 20704513 is a prime.

It is a super-2 number, since 2×20704529² = 857355042223682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20704729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352264 + 10352265.

It is an arithmetic number, because the mean of its divisors is an integer number (10352265).

Almost surely, 2^20704529 is an apocalyptic number.

It is an amenable number.

20704529 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704529 is an equidigital number, since it uses as much as digits as its factorization.

20704529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20704529 is about 4550.2229615701. Note that the first 3 decimals coincide. The cubic root of 20704529 is about 274.5923613359.

The spelling of 20704529 in words is "twenty million, seven hundred four thousand, five hundred twenty-nine".