20561760

素因数分解:

$2^5\times 3^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:261

約数の個数: 144

約数和(自身を含む): 71351280

約数和(自身を除く): 50789520

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 45, 48, 60, 72, 80, 90, 96, 109, 120, 131, 144, 160, 180, 218, 240, 262, 288, 327, 360, 393, 436, 480, 524, 545, 654, 655, 720, 786, 872, 981, 1048, 1090, 1179, 1308, 1310, 1440, 1572, 1635, 1744, 1962, 1965, 2096, 2180, 2358, 2616, 2620, 3144, 3270, 3488, 3924, 3930, 4192, 4360, 4716, 4905, 5232, 5240, 5895, 6288, 6540, 7848, 7860, 8720, 9432, 9810, 10464, 10480, 11790, 12576, 13080, 14279, 15696, 15720, 17440, 18864, 19620, 20960, 23580, 26160, 28558, 31392, 31440, 37728, 39240, 42837, 47160, 52320, 57116, 62880, 71395, 78480, 85674, 94320, 114232, 128511, 142790, 156960, 171348, 188640, 214185, 228464, 257022, 285580, 342696, 428370, 456928, 514044, 571160, 642555, 685392, 856740, 1028088, 1142320, 1285110, 1370784, 1713480, 2056176, 2284640, 2570220, 3426960, 4112352, 5140440, 6853920, 10280880, 20561760]

約数ペア:

[(1, 20561760), (2, 10280880), (3, 6853920), (4, 5140440), (5, 4112352), (6, 3426960), (8, 2570220), (9, 2284640), (10, 2056176), (12, 1713480), (15, 1370784), (16, 1285110), (18, 1142320), (20, 1028088), (24, 856740), (30, 685392), (32, 642555), (36, 571160), (40, 514044), (45, 456928), (48, 428370), (60, 342696), (72, 285580), (80, 257022), (90, 228464), (96, 214185), (109, 188640), (120, 171348), (131, 156960), (144, 142790), (160, 128511), (180, 114232), (218, 94320), (240, 85674), (262, 78480), (288, 71395), (327, 62880), (360, 57116), (393, 52320), (436, 47160), (480, 42837), (524, 39240), (545, 37728), (654, 31440), (655, 31392), (720, 28558), (786, 26160), (872, 23580), (981, 20960), (1048, 19620), (1090, 18864), (1179, 17440), (1308, 15720), (1310, 15696), (1440, 14279), (1572, 13080), (1635, 12576), (1744, 11790), (1962, 10480), (1965, 10464), (2096, 9810), (2180, 9432), (2358, 8720), (2616, 7860), (2620, 7848), (3144, 6540), (3270, 6288), (3488, 5895), (3924, 5240), (3930, 5232), (4192, 4905), (4360, 4716)]