20721960

素因数分解:

$2^3\times 3^3\times 5^1\times 7^1\times {\mathrm{2741}}^1$

素因数の和:2768

約数の個数: 128

約数和(自身を含む): 78969600

約数和(自身を除く): 58247640

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 21, 24, 27, 28, 30, 35, 36, 40, 42, 45, 54, 56, 60, 63, 70, 72, 84, 90, 105, 108, 120, 126, 135, 140, 168, 180, 189, 210, 216, 252, 270, 280, 315, 360, 378, 420, 504, 540, 630, 756, 840, 945, 1080, 1260, 1512, 1890, 2520, 2741, 3780, 5482, 7560, 8223, 10964, 13705, 16446, 19187, 21928, 24669, 27410, 32892, 38374, 41115, 49338, 54820, 57561, 65784, 74007, 76748, 82230, 95935, 98676, 109640, 115122, 123345, 148014, 153496, 164460, 172683, 191870, 197352, 230244, 246690, 287805, 296028, 328920, 345366, 370035, 383740, 460488, 493380, 518049, 575610, 592056, 690732, 740070, 767480, 863415, 986760, 1036098, 1151220, 1381464, 1480140, 1726830, 2072196, 2302440, 2590245, 2960280, 3453660, 4144392, 5180490, 6907320, 10360980, 20721960]

約数ペア:

[(1, 20721960), (2, 10360980), (3, 6907320), (4, 5180490), (5, 4144392), (6, 3453660), (7, 2960280), (8, 2590245), (9, 2302440), (10, 2072196), (12, 1726830), (14, 1480140), (15, 1381464), (18, 1151220), (20, 1036098), (21, 986760), (24, 863415), (27, 767480), (28, 740070), (30, 690732), (35, 592056), (36, 575610), (40, 518049), (42, 493380), (45, 460488), (54, 383740), (56, 370035), (60, 345366), (63, 328920), (70, 296028), (72, 287805), (84, 246690), (90, 230244), (105, 197352), (108, 191870), (120, 172683), (126, 164460), (135, 153496), (140, 148014), (168, 123345), (180, 115122), (189, 109640), (210, 98676), (216, 95935), (252, 82230), (270, 76748), (280, 74007), (315, 65784), (360, 57561), (378, 54820), (420, 49338), (504, 41115), (540, 38374), (630, 32892), (756, 27410), (840, 24669), (945, 21928), (1080, 19187), (1260, 16446), (1512, 13705), (1890, 10964), (2520, 8223), (2741, 7560), (3780, 5482)]