21332480

素因数分解:

$2^9\times 5^1\times {\mathrm{13}}^1\times {\mathrm{641}}^1$

素因数の和:677

約数の個数: 80

約数和(自身を含む): 55168344

約数和(自身を除く): 33835864

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 512, 520, 640, 641, 832, 1040, 1280, 1282, 1664, 2080, 2560, 2564, 3205, 3328, 4160, 5128, 6410, 6656, 8320, 8333, 10256, 12820, 16640, 16666, 20512, 25640, 33280, 33332, 41024, 41665, 51280, 66664, 82048, 83330, 102560, 133328, 164096, 166660, 205120, 266656, 328192, 333320, 410240, 533312, 666640, 820480, 1066624, 1333280, 1640960, 2133248, 2666560, 4266496, 5333120, 10666240, 21332480]

約数ペア:

[(1, 21332480), (2, 10666240), (4, 5333120), (5, 4266496), (8, 2666560), (10, 2133248), (13, 1640960), (16, 1333280), (20, 1066624), (26, 820480), (32, 666640), (40, 533312), (52, 410240), (64, 333320), (65, 328192), (80, 266656), (104, 205120), (128, 166660), (130, 164096), (160, 133328), (208, 102560), (256, 83330), (260, 82048), (320, 66664), (416, 51280), (512, 41665), (520, 41024), (640, 33332), (641, 33280), (832, 25640), (1040, 20512), (1280, 16666), (1282, 16640), (1664, 12820), (2080, 10256), (2560, 8333), (2564, 8320), (3205, 6656), (3328, 6410), (4160, 5128)]