20676869 has 2 divisors, whose sum is σ = 20676870. Its totient is φ = 20676868.

The previous prime is 20676863. The next prime is 20676871. The reversal of 20676869 is 96867602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 2512225 = 4262^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 20676869 - 2⁸ = 20676613 is a prime.

It is a super-2 number, since 2×20676869² = 855065823286322, which contains 22 as substring.

Together with 20676871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20676863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10338434 + 10338435.

It is an arithmetic number, because the mean of its divisors is an integer number (10338435).

Almost surely, 2^20676869 is an apocalyptic number.

It is an amenable number.

20676869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20676869 is an equidigital number, since it uses as much as digits as its factorization.

20676869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 20676869 is about 4547.1825342733. The cubic root of 20676869 is about 274.4700272404.

The spelling of 20676869 in words is "twenty million, six hundred seventy-six thousand, eight hundred sixty-nine".