20782506 has 8 divisors (see below), whose sum is σ = 41565024. Its totient is φ = 6927500.

The previous prime is 20782499. The next prime is 20782513. The reversal of 20782506 is 60528702.

It is an interprime number because it is at equal distance from previous prime (20782499) and next prime (20782513).

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

20782506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1731870 + ... + 1731881.

It is an arithmetic number, because the mean of its divisors is an integer number (5195628).

Almost surely, 2^20782506 is an apocalyptic number.

20782506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20782506 is a wasteful number, since it uses less digits than its factorization.

20782506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463756.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20782506 is about 4558.7833903356. The cubic root of 20782506 is about 274.9366509728.

The spelling of 20782506 in words is "twenty million, seven hundred eighty-two thousand, five hundred six".