20270909 has 2 divisors, whose sum is σ = 20270910. Its totient is φ = 20270908.

The previous prime is 20270879. The next prime is 20270911. The reversal of 20270909 is 90907202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14462809 + 5808100 = 3803^2 + 2410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20270909 is a prime.

It is a super-4 number, since 4×20270909⁴ (a number of 30 digits) contains 4444 as substring.

Together with 20270911, 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 (20270969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135454 + 10135455.

It is an arithmetic number, because the mean of its divisors is an integer number (10135455).

Almost surely, 2^20270909 is an apocalyptic number.

It is an amenable number.

20270909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20270909 is an equidigital number, since it uses as much as digits as its factorization.

20270909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 20270909 is about 4502.3226228248. The cubic root of 20270909 is about 272.6618694312.

The spelling of 20270909 in words is "twenty million, two hundred seventy thousand, nine hundred nine".