21209120

素因数分解:

$2^5\times 5^1\times {\mathrm{71}}^1\times {\mathrm{1867}}^1$

素因数の和:1953

約数の個数: 48

約数和(自身を含む): 50839488

約数和(自身を除く): 29630368

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 71, 80, 142, 160, 284, 355, 568, 710, 1136, 1420, 1867, 2272, 2840, 3734, 5680, 7468, 9335, 11360, 14936, 18670, 29872, 37340, 59744, 74680, 132557, 149360, 265114, 298720, 530228, 662785, 1060456, 1325570, 2120912, 2651140, 4241824, 5302280, 10604560, 21209120]

約数ペア:

[(1, 21209120), (2, 10604560), (4, 5302280), (5, 4241824), (8, 2651140), (10, 2120912), (16, 1325570), (20, 1060456), (32, 662785), (40, 530228), (71, 298720), (80, 265114), (142, 149360), (160, 132557), (284, 74680), (355, 59744), (568, 37340), (710, 29872), (1136, 18670), (1420, 14936), (1867, 11360), (2272, 9335), (2840, 7468), (3734, 5680)]