20782651 has 2 divisors, whose sum is σ = 20782652. Its totient is φ = 20782650.

The previous prime is 20782633. The next prime is 20782693. The reversal of 20782651 is 15628702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20782651 - 2²³ = 12394043 is a prime.

It is not a weakly prime, because it can be changed into another prime (20782051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391325 + 10391326.

It is an arithmetic number, because the mean of its divisors is an integer number (10391326).

Almost surely, 2^20782651 is an apocalyptic number.

20782651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20782651 is an equidigital number, since it uses as much as digits as its factorization.

20782651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 20782651 is about 4558.7992936737. The cubic root of 20782651 is about 274.9372903843.

The spelling of 20782651 in words is "twenty million, seven hundred eighty-two thousand, six hundred fifty-one".