20620843 has 2 divisors, whose sum is σ = 20620844. Its totient is φ = 20620842.

The previous prime is 20620837. The next prime is 20620849. The reversal of 20620843 is 34802602.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20620837) and next prime (20620849).

It is a cyclic number.

It is not a de Polignac number, because 20620843 - 2⁹ = 20620331 is a prime.

It is equal to p_1307428 and since 20620843 and 1307428 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20620849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310421 + 10310422.

It is an arithmetic number, because the mean of its divisors is an integer number (10310422).

Almost surely, 2^20620843 is an apocalyptic number.

20620843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620843 is an equidigital number, since it uses as much as digits as its factorization.

20620843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20620843 is about 4541.0178374457. The cubic root of 20620843 is about 274.2219018658.

The spelling of 20620843 in words is "twenty million, six hundred twenty thousand, eight hundred forty-three".