20001800

素因数分解:

$2^3\times 5^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{157}}^1$

素因数の和:200

約数の個数: 144

約数和(自身を含む): 58629060

約数和(自身を除く): 38627260

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 25, 26, 28, 35, 40, 49, 50, 52, 56, 65, 70, 91, 98, 100, 104, 130, 140, 157, 175, 182, 196, 200, 245, 260, 280, 314, 325, 350, 364, 392, 455, 490, 520, 628, 637, 650, 700, 728, 785, 910, 980, 1099, 1225, 1256, 1274, 1300, 1400, 1570, 1820, 1960, 2041, 2198, 2275, 2450, 2548, 2600, 3140, 3185, 3640, 3925, 4082, 4396, 4550, 4900, 5096, 5495, 6280, 6370, 7693, 7850, 8164, 8792, 9100, 9800, 10205, 10990, 12740, 14287, 15386, 15700, 15925, 16328, 18200, 20410, 21980, 25480, 27475, 28574, 30772, 31400, 31850, 38465, 40820, 43960, 51025, 54950, 57148, 61544, 63700, 71435, 76930, 81640, 100009, 102050, 109900, 114296, 127400, 142870, 153860, 192325, 200018, 204100, 219800, 285740, 307720, 357175, 384650, 400036, 408200, 500045, 571480, 714350, 769300, 800072, 1000090, 1428700, 1538600, 2000180, 2500225, 2857400, 4000360, 5000450, 10000900, 20001800]

約数ペア:

[(1, 20001800), (2, 10000900), (4, 5000450), (5, 4000360), (7, 2857400), (8, 2500225), (10, 2000180), (13, 1538600), (14, 1428700), (20, 1000090), (25, 800072), (26, 769300), (28, 714350), (35, 571480), (40, 500045), (49, 408200), (50, 400036), (52, 384650), (56, 357175), (65, 307720), (70, 285740), (91, 219800), (98, 204100), (100, 200018), (104, 192325), (130, 153860), (140, 142870), (157, 127400), (175, 114296), (182, 109900), (196, 102050), (200, 100009), (245, 81640), (260, 76930), (280, 71435), (314, 63700), (325, 61544), (350, 57148), (364, 54950), (392, 51025), (455, 43960), (490, 40820), (520, 38465), (628, 31850), (637, 31400), (650, 30772), (700, 28574), (728, 27475), (785, 25480), (910, 21980), (980, 20410), (1099, 18200), (1225, 16328), (1256, 15925), (1274, 15700), (1300, 15386), (1400, 14287), (1570, 12740), (1820, 10990), (1960, 10205), (2041, 9800), (2198, 9100), (2275, 8792), (2450, 8164), (2548, 7850), (2600, 7693), (3140, 6370), (3185, 6280), (3640, 5495), (3925, 5096), (4082, 4900), (4396, 4550)]