18820007 has 4 divisors (see below), whose sum is σ = 19427136. Its totient is φ = 18212880.

The previous prime is 18819991. The next prime is 18820031. The reversal of 18820007 is 70002881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18820007 - 2⁴ = 18819991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303518 + ... + 303579.

It is an arithmetic number, because the mean of its divisors is an integer number (4856784).

Almost surely, 2^18820007 is an apocalyptic number.

18820007 is a deficient number, since it is larger than the sum of its proper divisors (607129).

18820007 is an equidigital number, since it uses as much as digits as its factorization.

18820007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607128.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 18820007 is about 4338.2031994825. The cubic root of 18820007 is about 265.9948695941.

Adding to 18820007 its reverse (70002881), we get a palindrome (88822888).

The spelling of 18820007 in words is "eighteen million, eight hundred twenty thousand, seven".