20990340

素因数分解:

$2^2\times 3^5\times 5^1\times 7^1\times {\mathrm{617}}^1$

素因数の和:648

約数の個数: 144

約数和(自身を含む): 75583872

約数和(自身を除く): 54593532

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 27, 28, 30, 35, 36, 42, 45, 54, 60, 63, 70, 81, 84, 90, 105, 108, 126, 135, 140, 162, 180, 189, 210, 243, 252, 270, 315, 324, 378, 405, 420, 486, 540, 567, 617, 630, 756, 810, 945, 972, 1134, 1215, 1234, 1260, 1620, 1701, 1851, 1890, 2268, 2430, 2468, 2835, 3085, 3402, 3702, 3780, 4319, 4860, 5553, 5670, 6170, 6804, 7404, 8505, 8638, 9255, 11106, 11340, 12340, 12957, 16659, 17010, 17276, 18510, 21595, 22212, 25914, 27765, 33318, 34020, 37020, 38871, 43190, 49977, 51828, 55530, 64785, 66636, 77742, 83295, 86380, 99954, 111060, 116613, 129570, 149931, 155484, 166590, 194355, 199908, 233226, 249885, 259140, 299862, 333180, 349839, 388710, 466452, 499770, 583065, 599724, 699678, 749655, 777420, 999540, 1049517, 1166130, 1399356, 1499310, 1749195, 2099034, 2332260, 2998620, 3498390, 4198068, 5247585, 6996780, 10495170, 20990340]

約数ペア:

[(1, 20990340), (2, 10495170), (3, 6996780), (4, 5247585), (5, 4198068), (6, 3498390), (7, 2998620), (9, 2332260), (10, 2099034), (12, 1749195), (14, 1499310), (15, 1399356), (18, 1166130), (20, 1049517), (21, 999540), (27, 777420), (28, 749655), (30, 699678), (35, 599724), (36, 583065), (42, 499770), (45, 466452), (54, 388710), (60, 349839), (63, 333180), (70, 299862), (81, 259140), (84, 249885), (90, 233226), (105, 199908), (108, 194355), (126, 166590), (135, 155484), (140, 149931), (162, 129570), (180, 116613), (189, 111060), (210, 99954), (243, 86380), (252, 83295), (270, 77742), (315, 66636), (324, 64785), (378, 55530), (405, 51828), (420, 49977), (486, 43190), (540, 38871), (567, 37020), (617, 34020), (630, 33318), (756, 27765), (810, 25914), (945, 22212), (972, 21595), (1134, 18510), (1215, 17276), (1234, 17010), (1260, 16659), (1620, 12957), (1701, 12340), (1851, 11340), (1890, 11106), (2268, 9255), (2430, 8638), (2468, 8505), (2835, 7404), (3085, 6804), (3402, 6170), (3702, 5670), (3780, 5553), (4319, 4860)]