20970869 has 2 divisors, whose sum is σ = 20970870. Its totient is φ = 20970868.

The previous prime is 20970853. The next prime is 20970893. The reversal of 20970869 is 96807902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 3010225 = 4238^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 20970869 - 2⁴ = 20970853 is a prime.

It is a super-2 number, since 2×20970869² = 879554693230322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20970899) 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, 10485434 + 10485435.

It is an arithmetic number, because the mean of its divisors is an integer number (10485435).

Almost surely, 2^20970869 is an apocalyptic number.

It is an amenable number.

20970869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20970869 is an equidigital number, since it uses as much as digits as its factorization.

20970869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20970869 is about 4579.3961392306. The cubic root of 20970869 is about 275.7647868258.

The spelling of 20970869 in words is "twenty million, nine hundred seventy thousand, eight hundred sixty-nine".