18964720

素因数分解:

$2^4\times 5^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1$

素因数の和:242

約数の個数: 80

約数和(自身を含む): 46648800

約数和(自身を除く): 27684080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 37, 40, 43, 74, 80, 86, 148, 149, 172, 185, 215, 296, 298, 344, 370, 430, 592, 596, 688, 740, 745, 860, 1192, 1480, 1490, 1591, 1720, 2384, 2960, 2980, 3182, 3440, 5513, 5960, 6364, 6407, 7955, 11026, 11920, 12728, 12814, 15910, 22052, 25456, 25628, 27565, 31820, 32035, 44104, 51256, 55130, 63640, 64070, 88208, 102512, 110260, 127280, 128140, 220520, 237059, 256280, 441040, 474118, 512560, 948236, 1185295, 1896472, 2370590, 3792944, 4741180, 9482360, 18964720]

約数ペア:

[(1, 18964720), (2, 9482360), (4, 4741180), (5, 3792944), (8, 2370590), (10, 1896472), (16, 1185295), (20, 948236), (37, 512560), (40, 474118), (43, 441040), (74, 256280), (80, 237059), (86, 220520), (148, 128140), (149, 127280), (172, 110260), (185, 102512), (215, 88208), (296, 64070), (298, 63640), (344, 55130), (370, 51256), (430, 44104), (592, 32035), (596, 31820), (688, 27565), (740, 25628), (745, 25456), (860, 22052), (1192, 15910), (1480, 12814), (1490, 12728), (1591, 11920), (1720, 11026), (2384, 7955), (2960, 6407), (2980, 6364), (3182, 5960), (3440, 5513)]