20757967 has 2 divisors, whose sum is σ = 20757968. Its totient is φ = 20757966.

The previous prime is 20757953. The next prime is 20757991. The reversal of 20757967 is 76975702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20757967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20757907) 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, 10378983 + 10378984.

It is an arithmetic number, because the mean of its divisors is an integer number (10378984).

Almost surely, 2^20757967 is an apocalyptic number.

20757967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20757967 is an equidigital number, since it uses as much as digits as its factorization.

20757967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 20757967 is about 4556.0911975069. The cubic root of 20757967 is about 274.8283976241.

The spelling of 20757967 in words is "twenty million, seven hundred fifty-seven thousand, nine hundred sixty-seven".