20707949 has 2 divisors, whose sum is σ = 20707950. Its totient is φ = 20707948.

The previous prime is 20707937. The next prime is 20707957. The reversal of 20707949 is 94970702.

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., 20475625 + 232324 = 4525^2 + 482^2 .

It is a cyclic number.

It is not a de Polignac number, because 20707949 - 2⁴ = 20707933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20707979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353974 + 10353975.

It is an arithmetic number, because the mean of its divisors is an integer number (10353975).

Almost surely, 2^20707949 is an apocalyptic number.

It is an amenable number.

20707949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20707949 is an equidigital number, since it uses as much as digits as its factorization.

20707949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20707949 is about 4550.5987518128. The cubic root of 20707949 is about 274.6074796734.

The spelling of 20707949 in words is "twenty million, seven hundred seven thousand, nine hundred forty-nine".