21082720

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{337}}^1$

素因数の和:392

約数の個数: 96

約数和(自身を含む): 55194048

約数和(自身を除く): 34111328

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 23, 32, 34, 40, 46, 68, 80, 85, 92, 115, 136, 160, 170, 184, 230, 272, 337, 340, 368, 391, 460, 544, 674, 680, 736, 782, 920, 1348, 1360, 1564, 1685, 1840, 1955, 2696, 2720, 3128, 3370, 3680, 3910, 5392, 5729, 6256, 6740, 7751, 7820, 10784, 11458, 12512, 13480, 15502, 15640, 22916, 26960, 28645, 31004, 31280, 38755, 45832, 53920, 57290, 62008, 62560, 77510, 91664, 114580, 124016, 131767, 155020, 183328, 229160, 248032, 263534, 310040, 458320, 527068, 620080, 658835, 916640, 1054136, 1240160, 1317670, 2108272, 2635340, 4216544, 5270680, 10541360, 21082720]

約数ペア:

[(1, 21082720), (2, 10541360), (4, 5270680), (5, 4216544), (8, 2635340), (10, 2108272), (16, 1317670), (17, 1240160), (20, 1054136), (23, 916640), (32, 658835), (34, 620080), (40, 527068), (46, 458320), (68, 310040), (80, 263534), (85, 248032), (92, 229160), (115, 183328), (136, 155020), (160, 131767), (170, 124016), (184, 114580), (230, 91664), (272, 77510), (337, 62560), (340, 62008), (368, 57290), (391, 53920), (460, 45832), (544, 38755), (674, 31280), (680, 31004), (736, 28645), (782, 26960), (920, 22916), (1348, 15640), (1360, 15502), (1564, 13480), (1685, 12512), (1840, 11458), (1955, 10784), (2696, 7820), (2720, 7751), (3128, 6740), (3370, 6256), (3680, 5729), (3910, 5392)]