21007221520

素因数分解:

$2^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{643}}^1\times {\mathrm{8689}}^1$

素因数の和:9392

約数の個数: 80

約数和(自身を含む): 49964302080

約数和(自身を除く): 28957080560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 47, 80, 94, 188, 235, 376, 470, 643, 752, 940, 1286, 1880, 2572, 3215, 3760, 5144, 6430, 8689, 10288, 12860, 17378, 25720, 30221, 34756, 43445, 51440, 60442, 69512, 86890, 120884, 139024, 151105, 173780, 241768, 302210, 347560, 408383, 483536, 604420, 695120, 816766, 1208840, 1633532, 2041915, 2417680, 3267064, 4083830, 5587027, 6534128, 8167660, 11174054, 16335320, 22348108, 27935135, 32670640, 44696216, 55870270, 89392432, 111740540, 223481080, 262590269, 446962160, 525180538, 1050361076, 1312951345, 2100722152, 2625902690, 4201444304, 5251805380, 10503610760, 21007221520]

約数ペア:

[(1, 21007221520), (2, 10503610760), (4, 5251805380), (5, 4201444304), (8, 2625902690), (10, 2100722152), (16, 1312951345), (20, 1050361076), (40, 525180538), (47, 446962160), (80, 262590269), (94, 223481080), (188, 111740540), (235, 89392432), (376, 55870270), (470, 44696216), (643, 32670640), (752, 27935135), (940, 22348108), (1286, 16335320), (1880, 11174054), (2572, 8167660), (3215, 6534128), (3760, 5587027), (5144, 4083830), (6430, 3267064), (8689, 2417680), (10288, 2041915), (12860, 1633532), (17378, 1208840), (25720, 816766), (30221, 695120), (34756, 604420), (43445, 483536), (51440, 408383), (60442, 347560), (69512, 302210), (86890, 241768), (120884, 173780), (139024, 151105)]