20955520

素因数分解:

$2^7\times 5^1\times {\mathrm{137}}^1\times {\mathrm{239}}^1$

素因数の和:395

約数の個数: 64

約数和(自身を含む): 50673600

約数和(自身を除く): 29718080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 137, 160, 239, 274, 320, 478, 548, 640, 685, 956, 1096, 1195, 1370, 1912, 2192, 2390, 2740, 3824, 4384, 4780, 5480, 7648, 8768, 9560, 10960, 15296, 17536, 19120, 21920, 30592, 32743, 38240, 43840, 65486, 76480, 87680, 130972, 152960, 163715, 261944, 327430, 523888, 654860, 1047776, 1309720, 2095552, 2619440, 4191104, 5238880, 10477760, 20955520]

約数ペア:

[(1, 20955520), (2, 10477760), (4, 5238880), (5, 4191104), (8, 2619440), (10, 2095552), (16, 1309720), (20, 1047776), (32, 654860), (40, 523888), (64, 327430), (80, 261944), (128, 163715), (137, 152960), (160, 130972), (239, 87680), (274, 76480), (320, 65486), (478, 43840), (548, 38240), (640, 32743), (685, 30592), (956, 21920), (1096, 19120), (1195, 17536), (1370, 15296), (1912, 10960), (2192, 9560), (2390, 8768), (2740, 7648), (3824, 5480), (4384, 4780)]