20728100

素因数分解:

$2^2\times 5^2\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{137}}^1$

素因数の和:257

約数の個数: 72

約数和(自身を含む): 48512520

約数和(自身を除く): 27784420

約数列:

[1, 2, 4, 5, 10, 17, 20, 25, 34, 50, 68, 85, 89, 100, 137, 170, 178, 274, 340, 356, 425, 445, 548, 685, 850, 890, 1370, 1513, 1700, 1780, 2225, 2329, 2740, 3026, 3425, 4450, 4658, 6052, 6850, 7565, 8900, 9316, 11645, 12193, 13700, 15130, 23290, 24386, 30260, 37825, 46580, 48772, 58225, 60965, 75650, 116450, 121930, 151300, 207281, 232900, 243860, 304825, 414562, 609650, 829124, 1036405, 1219300, 2072810, 4145620, 5182025, 10364050, 20728100]

約数ペア:

[(1, 20728100), (2, 10364050), (4, 5182025), (5, 4145620), (10, 2072810), (17, 1219300), (20, 1036405), (25, 829124), (34, 609650), (50, 414562), (68, 304825), (85, 243860), (89, 232900), (100, 207281), (137, 151300), (170, 121930), (178, 116450), (274, 75650), (340, 60965), (356, 58225), (425, 48772), (445, 46580), (548, 37825), (685, 30260), (850, 24386), (890, 23290), (1370, 15130), (1513, 13700), (1700, 12193), (1780, 11645), (2225, 9316), (2329, 8900), (2740, 7565), (3026, 6850), (3425, 6052), (4450, 4658)]