21578320

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:244

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31454000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 58, 71, 80, 116, 131, 142, 145, 232, 262, 284, 290, 355, 464, 524, 568, 580, 655, 710, 1048, 1136, 1160, 1310, 1420, 2059, 2096, 2320, 2620, 2840, 3799, 4118, 5240, 5680, 7598, 8236, 9301, 10295, 10480, 15196, 16472, 18602, 18995, 20590, 30392, 32944, 37204, 37990, 41180, 46505, 60784, 74408, 75980, 82360, 93010, 148816, 151960, 164720, 186020, 269729, 303920, 372040, 539458, 744080, 1078916, 1348645, 2157832, 2697290, 4315664, 5394580, 10789160, 21578320]

約数ペア:

[(1, 21578320), (2, 10789160), (4, 5394580), (5, 4315664), (8, 2697290), (10, 2157832), (16, 1348645), (20, 1078916), (29, 744080), (40, 539458), (58, 372040), (71, 303920), (80, 269729), (116, 186020), (131, 164720), (142, 151960), (145, 148816), (232, 93010), (262, 82360), (284, 75980), (290, 74408), (355, 60784), (464, 46505), (524, 41180), (568, 37990), (580, 37204), (655, 32944), (710, 30392), (1048, 20590), (1136, 18995), (1160, 18602), (1310, 16472), (1420, 15196), (2059, 10480), (2096, 10295), (2320, 9301), (2620, 8236), (2840, 7598), (3799, 5680), (4118, 5240)]