21245920

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{107}}^1$

素因数の和:212

約数の個数: 96

約数和(自身を含む): 54377568

約数和(自身を除く): 33131648

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 73, 80, 85, 107, 136, 146, 160, 170, 214, 272, 292, 340, 365, 428, 535, 544, 584, 680, 730, 856, 1070, 1168, 1241, 1360, 1460, 1712, 1819, 2140, 2336, 2482, 2720, 2920, 3424, 3638, 4280, 4964, 5840, 6205, 7276, 7811, 8560, 9095, 9928, 11680, 12410, 14552, 15622, 17120, 18190, 19856, 24820, 29104, 31244, 36380, 39055, 39712, 49640, 58208, 62488, 72760, 78110, 99280, 124976, 132787, 145520, 156220, 198560, 249952, 265574, 291040, 312440, 531148, 624880, 663935, 1062296, 1249760, 1327870, 2124592, 2655740, 4249184, 5311480, 10622960, 21245920]

約数ペア:

[(1, 21245920), (2, 10622960), (4, 5311480), (5, 4249184), (8, 2655740), (10, 2124592), (16, 1327870), (17, 1249760), (20, 1062296), (32, 663935), (34, 624880), (40, 531148), (68, 312440), (73, 291040), (80, 265574), (85, 249952), (107, 198560), (136, 156220), (146, 145520), (160, 132787), (170, 124976), (214, 99280), (272, 78110), (292, 72760), (340, 62488), (365, 58208), (428, 49640), (535, 39712), (544, 39055), (584, 36380), (680, 31244), (730, 29104), (856, 24820), (1070, 19856), (1168, 18190), (1241, 17120), (1360, 15622), (1460, 14552), (1712, 12410), (1819, 11680), (2140, 9928), (2336, 9095), (2482, 8560), (2720, 7811), (2920, 7276), (3424, 6205), (3638, 5840), (4280, 4964)]