21354920

素因数分解:

$2^3\times 5^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{307}}^1$

素因数の和:402

約数の個数: 64

約数和(自身を含む): 50561280

約数和(自身を除く): 29206360

約数列:

[1, 2, 4, 5, 8, 10, 20, 37, 40, 47, 74, 94, 148, 185, 188, 235, 296, 307, 370, 376, 470, 614, 740, 940, 1228, 1480, 1535, 1739, 1880, 2456, 3070, 3478, 6140, 6956, 8695, 11359, 12280, 13912, 14429, 17390, 22718, 28858, 34780, 45436, 56795, 57716, 69560, 72145, 90872, 113590, 115432, 144290, 227180, 288580, 454360, 533873, 577160, 1067746, 2135492, 2669365, 4270984, 5338730, 10677460, 21354920]

約数ペア:

[(1, 21354920), (2, 10677460), (4, 5338730), (5, 4270984), (8, 2669365), (10, 2135492), (20, 1067746), (37, 577160), (40, 533873), (47, 454360), (74, 288580), (94, 227180), (148, 144290), (185, 115432), (188, 113590), (235, 90872), (296, 72145), (307, 69560), (370, 57716), (376, 56795), (470, 45436), (614, 34780), (740, 28858), (940, 22718), (1228, 17390), (1480, 14429), (1535, 13912), (1739, 12280), (1880, 11359), (2456, 8695), (3070, 6956), (3478, 6140)]