20908215

素因数分解:

$3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{181}}^1$

素因数の和:360

約数の個数: 48

約数和(自身を含む): 38840256

約数和(自身を除く): 17932041

約数列:

[1, 3, 5, 9, 15, 17, 45, 51, 85, 151, 153, 181, 255, 453, 543, 755, 765, 905, 1359, 1629, 2265, 2567, 2715, 3077, 6795, 7701, 8145, 9231, 12835, 15385, 23103, 27331, 27693, 38505, 46155, 81993, 115515, 136655, 138465, 245979, 409965, 464627, 1229895, 1393881, 2323135, 4181643, 6969405, 20908215]

約数ペア:

[(1, 20908215), (3, 6969405), (5, 4181643), (9, 2323135), (15, 1393881), (17, 1229895), (45, 464627), (51, 409965), (85, 245979), (151, 138465), (153, 136655), (181, 115515), (255, 81993), (453, 46155), (543, 38505), (755, 27693), (765, 27331), (905, 23103), (1359, 15385), (1629, 12835), (2265, 9231), (2567, 8145), (2715, 7701), (3077, 6795)]