21001840

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{337}}^1$

素因数の和:410

約数の個数: 80

約数和(自身を含む): 52809120

約数和(自身を除く): 31807280

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 41, 76, 80, 82, 95, 152, 164, 190, 205, 304, 328, 337, 380, 410, 656, 674, 760, 779, 820, 1348, 1520, 1558, 1640, 1685, 2696, 3116, 3280, 3370, 3895, 5392, 6232, 6403, 6740, 7790, 12464, 12806, 13480, 13817, 15580, 25612, 26960, 27634, 31160, 32015, 51224, 55268, 62320, 64030, 69085, 102448, 110536, 128060, 138170, 221072, 256120, 262523, 276340, 512240, 525046, 552680, 1050092, 1105360, 1312615, 2100184, 2625230, 4200368, 5250460, 10500920, 21001840]

約数ペア:

[(1, 21001840), (2, 10500920), (4, 5250460), (5, 4200368), (8, 2625230), (10, 2100184), (16, 1312615), (19, 1105360), (20, 1050092), (38, 552680), (40, 525046), (41, 512240), (76, 276340), (80, 262523), (82, 256120), (95, 221072), (152, 138170), (164, 128060), (190, 110536), (205, 102448), (304, 69085), (328, 64030), (337, 62320), (380, 55268), (410, 51224), (656, 32015), (674, 31160), (760, 27634), (779, 26960), (820, 25612), (1348, 15580), (1520, 13817), (1558, 13480), (1640, 12806), (1685, 12464), (2696, 7790), (3116, 6740), (3280, 6403), (3370, 6232), (3895, 5392)]