21520640

素因数分解:

$2^8\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1$

素因数の和:104

約数の個数: 144

約数和(自身を含む): 58278528

約数和(自身を除く): 36757888

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 23, 32, 34, 40, 43, 46, 64, 68, 80, 85, 86, 92, 115, 128, 136, 160, 170, 172, 184, 215, 230, 256, 272, 320, 340, 344, 368, 391, 430, 460, 544, 640, 680, 688, 731, 736, 782, 860, 920, 989, 1088, 1280, 1360, 1376, 1462, 1472, 1564, 1720, 1840, 1955, 1978, 2176, 2720, 2752, 2924, 2944, 3128, 3440, 3655, 3680, 3910, 3956, 4352, 4945, 5440, 5504, 5848, 5888, 6256, 6880, 7310, 7360, 7820, 7912, 9890, 10880, 11008, 11696, 12512, 13760, 14620, 14720, 15640, 15824, 16813, 19780, 21760, 23392, 25024, 27520, 29240, 29440, 31280, 31648, 33626, 39560, 46784, 50048, 55040, 58480, 62560, 63296, 67252, 79120, 84065, 93568, 100096, 116960, 125120, 126592, 134504, 158240, 168130, 187136, 233920, 250240, 253184, 269008, 316480, 336260, 467840, 500480, 538016, 632960, 672520, 935680, 1076032, 1265920, 1345040, 2152064, 2690080, 4304128, 5380160, 10760320, 21520640]

約数ペア:

[(1, 21520640), (2, 10760320), (4, 5380160), (5, 4304128), (8, 2690080), (10, 2152064), (16, 1345040), (17, 1265920), (20, 1076032), (23, 935680), (32, 672520), (34, 632960), (40, 538016), (43, 500480), (46, 467840), (64, 336260), (68, 316480), (80, 269008), (85, 253184), (86, 250240), (92, 233920), (115, 187136), (128, 168130), (136, 158240), (160, 134504), (170, 126592), (172, 125120), (184, 116960), (215, 100096), (230, 93568), (256, 84065), (272, 79120), (320, 67252), (340, 63296), (344, 62560), (368, 58480), (391, 55040), (430, 50048), (460, 46784), (544, 39560), (640, 33626), (680, 31648), (688, 31280), (731, 29440), (736, 29240), (782, 27520), (860, 25024), (920, 23392), (989, 21760), (1088, 19780), (1280, 16813), (1360, 15824), (1376, 15640), (1462, 14720), (1472, 14620), (1564, 13760), (1720, 12512), (1840, 11696), (1955, 11008), (1978, 10880), (2176, 9890), (2720, 7912), (2752, 7820), (2924, 7360), (2944, 7310), (3128, 6880), (3440, 6256), (3655, 5888), (3680, 5848), (3910, 5504), (3956, 5440), (4352, 4945)]