21987280

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:177

約数の個数: 120

約数和(自身を含む): 61067520

約数和(自身を除く): 39080240

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 71, 79, 80, 98, 112, 140, 142, 158, 196, 245, 280, 284, 316, 355, 392, 395, 490, 497, 553, 560, 568, 632, 710, 784, 790, 980, 994, 1106, 1136, 1264, 1420, 1580, 1960, 1988, 2212, 2485, 2765, 2840, 3160, 3479, 3871, 3920, 3976, 4424, 4970, 5530, 5609, 5680, 6320, 6958, 7742, 7952, 8848, 9940, 11060, 11218, 13916, 15484, 17395, 19355, 19880, 22120, 22436, 27832, 28045, 30968, 34790, 38710, 39263, 39760, 44240, 44872, 55664, 56090, 61936, 69580, 77420, 78526, 89744, 112180, 139160, 154840, 157052, 196315, 224360, 274841, 278320, 309680, 314104, 392630, 448720, 549682, 628208, 785260, 1099364, 1374205, 1570520, 2198728, 2748410, 3141040, 4397456, 5496820, 10993640, 21987280]

約数ペア:

[(1, 21987280), (2, 10993640), (4, 5496820), (5, 4397456), (7, 3141040), (8, 2748410), (10, 2198728), (14, 1570520), (16, 1374205), (20, 1099364), (28, 785260), (35, 628208), (40, 549682), (49, 448720), (56, 392630), (70, 314104), (71, 309680), (79, 278320), (80, 274841), (98, 224360), (112, 196315), (140, 157052), (142, 154840), (158, 139160), (196, 112180), (245, 89744), (280, 78526), (284, 77420), (316, 69580), (355, 61936), (392, 56090), (395, 55664), (490, 44872), (497, 44240), (553, 39760), (560, 39263), (568, 38710), (632, 34790), (710, 30968), (784, 28045), (790, 27832), (980, 22436), (994, 22120), (1106, 19880), (1136, 19355), (1264, 17395), (1420, 15484), (1580, 13916), (1960, 11218), (1988, 11060), (2212, 9940), (2485, 8848), (2765, 7952), (2840, 7742), (3160, 6958), (3479, 6320), (3871, 5680), (3920, 5609), (3976, 5530), (4424, 4970)]