20730869 has 2 divisors, whose sum is σ = 20730870. Its totient is φ = 20730868.

The previous prime is 20730839. The next prime is 20730887. The reversal of 20730869 is 96803702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 5808100 = 3863^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730869 - 2¹² = 20726773 is a prime.

It is a super-2 number, since 2×20730869² = 859537858990322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20730839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365434 + 10365435.

It is an arithmetic number, because the mean of its divisors is an integer number (10365435).

Almost surely, 2^20730869 is an apocalyptic number.

It is an amenable number.

20730869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730869 is an equidigital number, since it uses as much as digits as its factorization.

20730869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20730869 is about 4553.1164052767. The cubic root of 20730869 is about 274.7087561244.

The spelling of 20730869 in words is "twenty million, seven hundred thirty thousand, eight hundred sixty-nine".