20286980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{127}}^1\times {\mathrm{163}}^1$

素因数の和:313

約数の個数: 72

約数和(自身を含む): 50254848

約数和(自身を除く): 29967868

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 127, 140, 163, 196, 245, 254, 326, 490, 508, 635, 652, 815, 889, 980, 1141, 1270, 1630, 1778, 2282, 2540, 3260, 3556, 4445, 4564, 5705, 6223, 7987, 8890, 11410, 12446, 15974, 17780, 20701, 22820, 24892, 31115, 31948, 39935, 41402, 62230, 79870, 82804, 103505, 124460, 144907, 159740, 207010, 289814, 414020, 579628, 724535, 1014349, 1449070, 2028698, 2898140, 4057396, 5071745, 10143490, 20286980]

約数ペア:

[(1, 20286980), (2, 10143490), (4, 5071745), (5, 4057396), (7, 2898140), (10, 2028698), (14, 1449070), (20, 1014349), (28, 724535), (35, 579628), (49, 414020), (70, 289814), (98, 207010), (127, 159740), (140, 144907), (163, 124460), (196, 103505), (245, 82804), (254, 79870), (326, 62230), (490, 41402), (508, 39935), (635, 31948), (652, 31115), (815, 24892), (889, 22820), (980, 20701), (1141, 17780), (1270, 15974), (1630, 12446), (1778, 11410), (2282, 8890), (2540, 7987), (3260, 6223), (3556, 5705), (4445, 4564)]