20820967 has 2 divisors, whose sum is σ = 20820968. Its totient is φ = 20820966.

The previous prime is 20820959. The next prime is 20820977. The reversal of 20820967 is 76902802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20820967 - 2³ = 20820959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20820977) 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, 10410483 + 10410484.

It is an arithmetic number, because the mean of its divisors is an integer number (10410484).

Almost surely, 2^20820967 is an apocalyptic number.

20820967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820967 is an equidigital number, since it uses as much as digits as its factorization.

20820967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20820967 is about 4562.9997808459. Note that the first 3 decimals coincide. The cubic root of 20820967 is about 275.1061496547.

The spelling of 20820967 in words is "twenty million, eight hundred twenty thousand, nine hundred sixty-seven".