20782461 has 8 divisors (see below), whose sum is σ = 31668544. Its totient is φ = 11875680.

The previous prime is 20782417. The next prime is 20782469. The reversal of 20782461 is 16428702.

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

It is not a de Polignac number, because 20782461 - 2¹⁰ = 20781437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782469) 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, 494800 + ... + 494841.

It is an arithmetic number, because the mean of its divisors is an integer number (3958568).

Almost surely, 2^20782461 is an apocalyptic number.

20782461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20782461 is a deficient number, since it is larger than the sum of its proper divisors (10886083).

20782461 is an equidigital number, since it uses as much as digits as its factorization.

20782461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989651.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20782461 is about 4558.7784548056. The cubic root of 20782461 is about 274.9364525341.

The spelling of 20782461 in words is "twenty million, seven hundred eighty-two thousand, four hundred sixty-one".