21745880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:145

約数の個数: 128

約数和(自身を含む): 58060800

約数和(自身を除く): 36314920

約数列:

[1, 2, 4, 5, 8, 10, 13, 19, 20, 26, 31, 38, 40, 52, 62, 65, 71, 76, 95, 104, 124, 130, 142, 152, 155, 190, 247, 248, 260, 284, 310, 355, 380, 403, 494, 520, 568, 589, 620, 710, 760, 806, 923, 988, 1178, 1235, 1240, 1349, 1420, 1612, 1846, 1976, 2015, 2201, 2356, 2470, 2698, 2840, 2945, 3224, 3692, 4030, 4402, 4615, 4712, 4940, 5396, 5890, 6745, 7384, 7657, 8060, 8804, 9230, 9880, 10792, 11005, 11780, 13490, 15314, 16120, 17537, 17608, 18460, 22010, 23560, 26980, 28613, 30628, 35074, 36920, 38285, 41819, 44020, 53960, 57226, 61256, 70148, 76570, 83638, 87685, 88040, 114452, 140296, 143065, 153140, 167276, 175370, 209095, 228904, 286130, 306280, 334552, 350740, 418190, 543647, 572260, 701480, 836380, 1087294, 1144520, 1672760, 2174588, 2718235, 4349176, 5436470, 10872940, 21745880]

約数ペア:

[(1, 21745880), (2, 10872940), (4, 5436470), (5, 4349176), (8, 2718235), (10, 2174588), (13, 1672760), (19, 1144520), (20, 1087294), (26, 836380), (31, 701480), (38, 572260), (40, 543647), (52, 418190), (62, 350740), (65, 334552), (71, 306280), (76, 286130), (95, 228904), (104, 209095), (124, 175370), (130, 167276), (142, 153140), (152, 143065), (155, 140296), (190, 114452), (247, 88040), (248, 87685), (260, 83638), (284, 76570), (310, 70148), (355, 61256), (380, 57226), (403, 53960), (494, 44020), (520, 41819), (568, 38285), (589, 36920), (620, 35074), (710, 30628), (760, 28613), (806, 26980), (923, 23560), (988, 22010), (1178, 18460), (1235, 17608), (1240, 17537), (1349, 16120), (1420, 15314), (1612, 13490), (1846, 11780), (1976, 11005), (2015, 10792), (2201, 9880), (2356, 9230), (2470, 8804), (2698, 8060), (2840, 7657), (2945, 7384), (3224, 6745), (3692, 5890), (4030, 5396), (4402, 4940), (4615, 4712)]