21091980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{3863}}^1$

素因数の和:3895

約数の個数: 96

約数和(自身を含む): 72705024

約数和(自身を除く): 51613044

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 13, 14, 15, 20, 21, 26, 28, 30, 35, 39, 42, 52, 60, 65, 70, 78, 84, 91, 105, 130, 140, 156, 182, 195, 210, 260, 273, 364, 390, 420, 455, 546, 780, 910, 1092, 1365, 1820, 2730, 3863, 5460, 7726, 11589, 15452, 19315, 23178, 27041, 38630, 46356, 50219, 54082, 57945, 77260, 81123, 100438, 108164, 115890, 135205, 150657, 162246, 200876, 231780, 251095, 270410, 301314, 324492, 351533, 405615, 502190, 540820, 602628, 703066, 753285, 811230, 1004380, 1054599, 1406132, 1506570, 1622460, 1757665, 2109198, 3013140, 3515330, 4218396, 5272995, 7030660, 10545990, 21091980]

約数ペア:

[(1, 21091980), (2, 10545990), (3, 7030660), (4, 5272995), (5, 4218396), (6, 3515330), (7, 3013140), (10, 2109198), (12, 1757665), (13, 1622460), (14, 1506570), (15, 1406132), (20, 1054599), (21, 1004380), (26, 811230), (28, 753285), (30, 703066), (35, 602628), (39, 540820), (42, 502190), (52, 405615), (60, 351533), (65, 324492), (70, 301314), (78, 270410), (84, 251095), (91, 231780), (105, 200876), (130, 162246), (140, 150657), (156, 135205), (182, 115890), (195, 108164), (210, 100438), (260, 81123), (273, 77260), (364, 57945), (390, 54082), (420, 50219), (455, 46356), (546, 38630), (780, 27041), (910, 23178), (1092, 19315), (1365, 15452), (1820, 11589), (2730, 7726), (3863, 5460)]