55820207 has 2 divisors, whose sum is σ = 55820208. Its totient is φ = 55820206.

The previous prime is 55820201. The next prime is 55820227. The reversal of 55820207 is 70202855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55820207 - 2¹⁴ = 55803823 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55820207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55820201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27910103 + 27910104.

It is an arithmetic number, because the mean of its divisors is an integer number (27910104).

Almost surely, 2^55820207 is an apocalyptic number.

55820207 is a deficient number, since it is larger than the sum of its proper divisors (1).

55820207 is an equidigital number, since it uses as much as digits as its factorization.

55820207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 55820207 is about 7471.2921907793. The cubic root of 55820207 is about 382.1763551634.

The spelling of 55820207 in words is "fifty-five million, eight hundred twenty thousand, two hundred seven".