21781578

素因数分解:

$2^1\times 3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{139}}^1$

素因数の和:212

約数の個数: 96

約数和(自身を含む): 56306880

約数和(自身を除く): 34525302

約数列:

[1, 2, 3, 6, 7, 13, 14, 21, 26, 39, 41, 42, 49, 78, 82, 91, 98, 123, 139, 147, 182, 246, 273, 278, 287, 294, 417, 533, 546, 574, 637, 834, 861, 973, 1066, 1274, 1599, 1722, 1807, 1911, 1946, 2009, 2919, 3198, 3614, 3731, 3822, 4018, 5421, 5699, 5838, 6027, 6811, 7462, 10842, 11193, 11398, 12054, 12649, 13622, 17097, 20433, 22386, 25298, 26117, 34194, 37947, 39893, 40866, 52234, 74087, 75894, 78351, 79786, 88543, 119679, 148174, 156702, 177086, 222261, 239358, 265629, 279251, 444522, 518609, 531258, 558502, 837753, 1037218, 1555827, 1675506, 3111654, 3630263, 7260526, 10890789, 21781578]

約数ペア:

[(1, 21781578), (2, 10890789), (3, 7260526), (6, 3630263), (7, 3111654), (13, 1675506), (14, 1555827), (21, 1037218), (26, 837753), (39, 558502), (41, 531258), (42, 518609), (49, 444522), (78, 279251), (82, 265629), (91, 239358), (98, 222261), (123, 177086), (139, 156702), (147, 148174), (182, 119679), (246, 88543), (273, 79786), (278, 78351), (287, 75894), (294, 74087), (417, 52234), (533, 40866), (546, 39893), (574, 37947), (637, 34194), (834, 26117), (861, 25298), (973, 22386), (1066, 20433), (1274, 17097), (1599, 13622), (1722, 12649), (1807, 12054), (1911, 11398), (1946, 11193), (2009, 10842), (2919, 7462), (3198, 6811), (3614, 6027), (3731, 5838), (3822, 5699), (4018, 5421)]