21387768

素因数分解:

$2^3\times 3^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1$

素因数の和:165

約数の個数: 128

約数和(自身を含む): 62208000

約数和(自身を除く): 40820232

約数列:

[1, 2, 3, 4, 6, 8, 12, 17, 19, 24, 31, 34, 38, 51, 57, 62, 68, 76, 89, 93, 102, 114, 124, 136, 152, 178, 186, 204, 228, 248, 267, 323, 356, 372, 408, 456, 527, 534, 589, 646, 712, 744, 969, 1054, 1068, 1178, 1292, 1513, 1581, 1691, 1767, 1938, 2108, 2136, 2356, 2584, 2759, 3026, 3162, 3382, 3534, 3876, 4216, 4539, 4712, 5073, 5518, 6052, 6324, 6764, 7068, 7752, 8277, 9078, 10013, 10146, 11036, 12104, 12648, 13528, 14136, 16554, 18156, 20026, 20292, 22072, 28747, 30039, 33108, 36312, 40052, 40584, 46903, 52421, 57494, 60078, 66216, 80104, 86241, 93806, 104842, 114988, 120156, 140709, 157263, 172482, 187612, 209684, 229976, 240312, 281418, 314526, 344964, 375224, 419368, 562836, 629052, 689928, 891157, 1125672, 1258104, 1782314, 2673471, 3564628, 5346942, 7129256, 10693884, 21387768]

約数ペア:

[(1, 21387768), (2, 10693884), (3, 7129256), (4, 5346942), (6, 3564628), (8, 2673471), (12, 1782314), (17, 1258104), (19, 1125672), (24, 891157), (31, 689928), (34, 629052), (38, 562836), (51, 419368), (57, 375224), (62, 344964), (68, 314526), (76, 281418), (89, 240312), (93, 229976), (102, 209684), (114, 187612), (124, 172482), (136, 157263), (152, 140709), (178, 120156), (186, 114988), (204, 104842), (228, 93806), (248, 86241), (267, 80104), (323, 66216), (356, 60078), (372, 57494), (408, 52421), (456, 46903), (527, 40584), (534, 40052), (589, 36312), (646, 33108), (712, 30039), (744, 28747), (969, 22072), (1054, 20292), (1068, 20026), (1178, 18156), (1292, 16554), (1513, 14136), (1581, 13528), (1691, 12648), (1767, 12104), (1938, 11036), (2108, 10146), (2136, 10013), (2356, 9078), (2584, 8277), (2759, 7752), (3026, 7068), (3162, 6764), (3382, 6324), (3534, 6052), (3876, 5518), (4216, 5073), (4539, 4712)]