20869001 has 2 divisors, whose sum is σ = 20869002. Its totient is φ = 20869000.

The previous prime is 20868997. The next prime is 20869003. The reversal of 20869001 is 10096802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10883401 + 9985600 = 3299^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20869001 - 2² = 20868997 is a prime.

Together with 20869003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20869003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434500 + 10434501.

It is an arithmetic number, because the mean of its divisors is an integer number (10434501).

Almost surely, 2^20869001 is an apocalyptic number.

It is an amenable number.

20869001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20869001 is an equidigital number, since it uses as much as digits as its factorization.

20869001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20869001 is about 4568.2601721005. The cubic root of 20869001 is about 275.3175439330.

The spelling of 20869001 in words is "twenty million, eight hundred sixty-nine thousand, one".