18820505 has 8 divisors (see below), whose sum is σ = 24637824. Its totient is φ = 13687600.

The previous prime is 18820493. The next prime is 18820519. The reversal of 18820505 is 50502881.

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

It is not a de Polignac number, because 18820505 - 2¹² = 18816409 is a prime.

It is a super-2 number, since 2×18820505² = 708422816910050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171041 + ... + 171150.

It is an arithmetic number, because the mean of its divisors is an integer number (3079728).

Almost surely, 2^18820505 is an apocalyptic number.

It is an amenable number.

18820505 is a deficient number, since it is larger than the sum of its proper divisors (5817319).

18820505 is a wasteful number, since it uses less digits than its factorization.

18820505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342207.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 18820505 is about 4338.2605961376. The cubic root of 18820505 is about 265.9972157547.

The spelling of 18820505 in words is "eighteen million, eight hundred twenty thousand, five hundred five".