20985440

素因数分解:

$2^5\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{457}}^1$

素因数の和:520

約数の個数: 96

約数和(自身を含む): 58169664

約数和(自身を除く): 37184224

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 41, 56, 70, 80, 82, 112, 140, 160, 164, 205, 224, 280, 287, 328, 410, 457, 560, 574, 656, 820, 914, 1120, 1148, 1312, 1435, 1640, 1828, 2285, 2296, 2870, 3199, 3280, 3656, 4570, 4592, 5740, 6398, 6560, 7312, 9140, 9184, 11480, 12796, 14624, 15995, 18280, 18737, 22960, 25592, 31990, 36560, 37474, 45920, 51184, 63980, 73120, 74948, 93685, 102368, 127960, 131159, 149896, 187370, 255920, 262318, 299792, 374740, 511840, 524636, 599584, 655795, 749480, 1049272, 1311590, 1498960, 2098544, 2623180, 2997920, 4197088, 5246360, 10492720, 20985440]

約数ペア:

[(1, 20985440), (2, 10492720), (4, 5246360), (5, 4197088), (7, 2997920), (8, 2623180), (10, 2098544), (14, 1498960), (16, 1311590), (20, 1049272), (28, 749480), (32, 655795), (35, 599584), (40, 524636), (41, 511840), (56, 374740), (70, 299792), (80, 262318), (82, 255920), (112, 187370), (140, 149896), (160, 131159), (164, 127960), (205, 102368), (224, 93685), (280, 74948), (287, 73120), (328, 63980), (410, 51184), (457, 45920), (560, 37474), (574, 36560), (656, 31990), (820, 25592), (914, 22960), (1120, 18737), (1148, 18280), (1312, 15995), (1435, 14624), (1640, 12796), (1828, 11480), (2285, 9184), (2296, 9140), (2870, 7312), (3199, 6560), (3280, 6398), (3656, 5740), (4570, 4592)]