20908967 has 2 divisors, whose sum is σ = 20908968. Its totient is φ = 20908966.

The previous prime is 20908957. The next prime is 20908981. The reversal of 20908967 is 76980902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20908967 - 2⁸ = 20908711 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 (20908907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454483 + 10454484.

It is an arithmetic number, because the mean of its divisors is an integer number (10454484).

Almost surely, 2^20908967 is an apocalyptic number.

20908967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908967 is an equidigital number, since it uses as much as digits as its factorization.

20908967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20908967 is about 4572.6323928346. The cubic root of 20908967 is about 275.4931844169.

The spelling of 20908967 in words is "twenty million, nine hundred eight thousand, nine hundred sixty-seven".