18820507 has 8 divisors (see below), whose sum is σ = 20494800. Its totient is φ = 17214624.

The previous prime is 18820493. The next prime is 18820519. The reversal of 18820507 is 70502881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18820507 - 2²³ = 10431899 is a prime.

It is a super-2 number, since 2×18820507² = 708422967474098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18830507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16528 + ... + 17629.

It is an arithmetic number, because the mean of its divisors is an integer number (2561850).

Almost surely, 2^18820507 is an apocalyptic number.

18820507 is a deficient number, since it is larger than the sum of its proper divisors (1674293).

18820507 is a wasteful number, since it uses less digits than its factorization.

18820507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34205.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 18820507 is about 4338.2608266447. The cubic root of 18820507 is about 265.9972251769.

The spelling of 18820507 in words is "eighteen million, eight hundred twenty thousand, five hundred seven".