20355440

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{223}}^1$

素因数の和:406

約数の個数: 80

約数和(自身を含む): 54663168

約数和(自身を除く): 34307728

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 163, 223, 280, 326, 446, 560, 652, 815, 892, 1115, 1141, 1304, 1561, 1630, 1784, 2230, 2282, 2608, 3122, 3260, 3568, 4460, 4564, 5705, 6244, 6520, 7805, 8920, 9128, 11410, 12488, 13040, 15610, 17840, 18256, 22820, 24976, 31220, 36349, 45640, 62440, 72698, 91280, 124880, 145396, 181745, 254443, 290792, 363490, 508886, 581584, 726980, 1017772, 1272215, 1453960, 2035544, 2544430, 2907920, 4071088, 5088860, 10177720, 20355440]

約数ペア:

[(1, 20355440), (2, 10177720), (4, 5088860), (5, 4071088), (7, 2907920), (8, 2544430), (10, 2035544), (14, 1453960), (16, 1272215), (20, 1017772), (28, 726980), (35, 581584), (40, 508886), (56, 363490), (70, 290792), (80, 254443), (112, 181745), (140, 145396), (163, 124880), (223, 91280), (280, 72698), (326, 62440), (446, 45640), (560, 36349), (652, 31220), (815, 24976), (892, 22820), (1115, 18256), (1141, 17840), (1304, 15610), (1561, 13040), (1630, 12488), (1784, 11410), (2230, 9128), (2282, 8920), (2608, 7805), (3122, 6520), (3260, 6244), (3568, 5705), (4460, 4564)]