81789220

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{45949}}^1$

素因数の和:46047

約数の個数: 24

約数和(自身を含む): 173691000

約数和(自身を除く): 91901780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 45949, 91898, 183796, 229745, 459490, 918980, 4089461, 8178922, 16357844, 20447305, 40894610, 81789220]

約数ペア:

[(1, 81789220), (2, 40894610), (4, 20447305), (5, 16357844), (10, 8178922), (20, 4089461), (89, 918980), (178, 459490), (356, 229745), (445, 183796), (890, 91898), (1780, 45949)]