21175840

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{73}}^1$

素因数の和:139

約数の個数: 144

約数和(自身を含む): 60587352

約数和(自身を除く): 39411512

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 37, 40, 49, 56, 70, 73, 74, 80, 98, 112, 140, 146, 148, 160, 185, 196, 224, 245, 259, 280, 292, 296, 365, 370, 392, 490, 511, 518, 560, 584, 592, 730, 740, 784, 980, 1022, 1036, 1120, 1168, 1184, 1295, 1460, 1480, 1568, 1813, 1960, 2044, 2072, 2336, 2555, 2590, 2701, 2920, 2960, 3577, 3626, 3920, 4088, 4144, 5110, 5180, 5402, 5840, 5920, 7154, 7252, 7840, 8176, 8288, 9065, 10220, 10360, 10804, 11680, 13505, 14308, 14504, 16352, 17885, 18130, 18907, 20440, 20720, 21608, 27010, 28616, 29008, 35770, 36260, 37814, 40880, 41440, 43216, 54020, 57232, 58016, 71540, 72520, 75628, 81760, 86432, 94535, 108040, 114464, 132349, 143080, 145040, 151256, 189070, 216080, 264698, 286160, 290080, 302512, 378140, 432160, 529396, 572320, 605024, 661745, 756280, 1058792, 1323490, 1512560, 2117584, 2646980, 3025120, 4235168, 5293960, 10587920, 21175840]

約数ペア:

[(1, 21175840), (2, 10587920), (4, 5293960), (5, 4235168), (7, 3025120), (8, 2646980), (10, 2117584), (14, 1512560), (16, 1323490), (20, 1058792), (28, 756280), (32, 661745), (35, 605024), (37, 572320), (40, 529396), (49, 432160), (56, 378140), (70, 302512), (73, 290080), (74, 286160), (80, 264698), (98, 216080), (112, 189070), (140, 151256), (146, 145040), (148, 143080), (160, 132349), (185, 114464), (196, 108040), (224, 94535), (245, 86432), (259, 81760), (280, 75628), (292, 72520), (296, 71540), (365, 58016), (370, 57232), (392, 54020), (490, 43216), (511, 41440), (518, 40880), (560, 37814), (584, 36260), (592, 35770), (730, 29008), (740, 28616), (784, 27010), (980, 21608), (1022, 20720), (1036, 20440), (1120, 18907), (1168, 18130), (1184, 17885), (1295, 16352), (1460, 14504), (1480, 14308), (1568, 13505), (1813, 11680), (1960, 10804), (2044, 10360), (2072, 10220), (2336, 9065), (2555, 8288), (2590, 8176), (2701, 7840), (2920, 7252), (2960, 7154), (3577, 5920), (3626, 5840), (3920, 5402), (4088, 5180), (4144, 5110)]