21176820

素因数分解:

$2^2\times 3^2\times 5^1\times 7^6$

素因数の和:57

約数の個数: 126

約数和(自身を含む): 74942322

約数和(自身を除く): 53765502

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 49, 60, 63, 70, 84, 90, 98, 105, 126, 140, 147, 180, 196, 210, 245, 252, 294, 315, 343, 420, 441, 490, 588, 630, 686, 735, 882, 980, 1029, 1260, 1372, 1470, 1715, 1764, 2058, 2205, 2401, 2940, 3087, 3430, 4116, 4410, 4802, 5145, 6174, 6860, 7203, 8820, 9604, 10290, 12005, 12348, 14406, 15435, 16807, 20580, 21609, 24010, 28812, 30870, 33614, 36015, 43218, 48020, 50421, 61740, 67228, 72030, 84035, 86436, 100842, 108045, 117649, 144060, 151263, 168070, 201684, 216090, 235298, 252105, 302526, 336140, 352947, 432180, 470596, 504210, 588245, 605052, 705894, 756315, 1008420, 1058841, 1176490, 1411788, 1512630, 1764735, 2117682, 2352980, 3025260, 3529470, 4235364, 5294205, 7058940, 10588410, 21176820]

約数ペア:

[(1, 21176820), (2, 10588410), (3, 7058940), (4, 5294205), (5, 4235364), (6, 3529470), (7, 3025260), (9, 2352980), (10, 2117682), (12, 1764735), (14, 1512630), (15, 1411788), (18, 1176490), (20, 1058841), (21, 1008420), (28, 756315), (30, 705894), (35, 605052), (36, 588245), (42, 504210), (45, 470596), (49, 432180), (60, 352947), (63, 336140), (70, 302526), (84, 252105), (90, 235298), (98, 216090), (105, 201684), (126, 168070), (140, 151263), (147, 144060), (180, 117649), (196, 108045), (210, 100842), (245, 86436), (252, 84035), (294, 72030), (315, 67228), (343, 61740), (420, 50421), (441, 48020), (490, 43218), (588, 36015), (630, 33614), (686, 30870), (735, 28812), (882, 24010), (980, 21609), (1029, 20580), (1260, 16807), (1372, 15435), (1470, 14406), (1715, 12348), (1764, 12005), (2058, 10290), (2205, 9604), (2401, 8820), (2940, 7203), (3087, 6860), (3430, 6174), (4116, 5145), (4410, 4802)]