20912069 has 2 divisors, whose sum is σ = 20912070. Its totient is φ = 20912068.

The previous prime is 20912053. The next prime is 20912071. The reversal of 20912069 is 96021902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18809569 + 2102500 = 4337^2 + 1450^2 .

It is a cyclic number.

It is not a de Polignac number, because 20912069 - 2⁴ = 20912053 is a prime.

It is a super-2 number, since 2×20912069² = 874629259721522, which contains 22 as substring.

Together with 20912071, 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 (20912029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456034 + 10456035.

It is an arithmetic number, because the mean of its divisors is an integer number (10456035).

Almost surely, 2^20912069 is an apocalyptic number.

It is an amenable number.

20912069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912069 is an equidigital number, since it uses as much as digits as its factorization.

20912069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20912069 is about 4572.9715721837. The cubic root of 20912069 is about 275.5068075608.

The spelling of 20912069 in words is "twenty million, nine hundred twelve thousand, sixty-nine".