21025940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{71}}^1$

素因数の和:177

約数の個数: 96

約数和(自身を含む): 51819264

約数和(自身を除く): 30793324

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 67, 68, 71, 85, 130, 134, 142, 170, 221, 260, 268, 284, 335, 340, 355, 442, 670, 710, 871, 884, 923, 1105, 1139, 1207, 1340, 1420, 1742, 1846, 2210, 2278, 2414, 3484, 3692, 4355, 4420, 4556, 4615, 4757, 4828, 5695, 6035, 8710, 9230, 9514, 11390, 12070, 14807, 15691, 17420, 18460, 19028, 22780, 23785, 24140, 29614, 31382, 47570, 59228, 61841, 62764, 74035, 78455, 80869, 95140, 123682, 148070, 156910, 161738, 247364, 296140, 309205, 313820, 323476, 404345, 618410, 808690, 1051297, 1236820, 1617380, 2102594, 4205188, 5256485, 10512970, 21025940]

約数ペア:

[(1, 21025940), (2, 10512970), (4, 5256485), (5, 4205188), (10, 2102594), (13, 1617380), (17, 1236820), (20, 1051297), (26, 808690), (34, 618410), (52, 404345), (65, 323476), (67, 313820), (68, 309205), (71, 296140), (85, 247364), (130, 161738), (134, 156910), (142, 148070), (170, 123682), (221, 95140), (260, 80869), (268, 78455), (284, 74035), (335, 62764), (340, 61841), (355, 59228), (442, 47570), (670, 31382), (710, 29614), (871, 24140), (884, 23785), (923, 22780), (1105, 19028), (1139, 18460), (1207, 17420), (1340, 15691), (1420, 14807), (1742, 12070), (1846, 11390), (2210, 9514), (2278, 9230), (2414, 8710), (3484, 6035), (3692, 5695), (4355, 4828), (4420, 4757), (4556, 4615)]