820660503 has 8 divisors (see below), whose sum is σ = 1178384368. Its totient is φ = 505021824.

The previous prime is 820660457. The next prime is 820660537. The reversal of 820660503 is 305066028.

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

It is not a de Polignac number, because 820660503 - 2⁶ = 820660439 is a prime.

It is a super-2 number, since 2×820660503² = 1346967322368426018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820660553) 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, 10521250 + ... + 10521327.

It is an arithmetic number, because the mean of its divisors is an integer number (147298046).

Almost surely, 2^820660503 is an apocalyptic number.

820660503 is a deficient number, since it is larger than the sum of its proper divisors (357723865).

820660503 is a wasteful number, since it uses less digits than its factorization.

820660503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21042593.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 820660503 is about 28647.1726877191. The cubic root of 820660503 is about 936.2414055633.

The spelling of 820660503 in words is "eight hundred twenty million, six hundred sixty thousand, five hundred three".