20991516

素因数分解:

$2^2\times 3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{409}}^1$

素因数の和:483

約数の個数: 96

約数和(自身を含む): 61716480

約数和(自身を除く): 40724964

約数列:

[1, 2, 3, 4, 6, 7, 12, 13, 14, 21, 26, 28, 39, 42, 47, 52, 78, 84, 91, 94, 141, 156, 182, 188, 273, 282, 329, 364, 409, 546, 564, 611, 658, 818, 987, 1092, 1222, 1227, 1316, 1636, 1833, 1974, 2444, 2454, 2863, 3666, 3948, 4277, 4908, 5317, 5726, 7332, 8554, 8589, 10634, 11452, 12831, 15951, 17108, 17178, 19223, 21268, 25662, 31902, 34356, 37219, 38446, 51324, 57669, 63804, 74438, 76892, 111657, 115338, 134561, 148876, 223314, 230676, 249899, 269122, 403683, 446628, 499798, 538244, 749697, 807366, 999596, 1499394, 1614732, 1749293, 2998788, 3498586, 5247879, 6997172, 10495758, 20991516]

約数ペア:

[(1, 20991516), (2, 10495758), (3, 6997172), (4, 5247879), (6, 3498586), (7, 2998788), (12, 1749293), (13, 1614732), (14, 1499394), (21, 999596), (26, 807366), (28, 749697), (39, 538244), (42, 499798), (47, 446628), (52, 403683), (78, 269122), (84, 249899), (91, 230676), (94, 223314), (141, 148876), (156, 134561), (182, 115338), (188, 111657), (273, 76892), (282, 74438), (329, 63804), (364, 57669), (409, 51324), (546, 38446), (564, 37219), (611, 34356), (658, 31902), (818, 25662), (987, 21268), (1092, 19223), (1222, 17178), (1227, 17108), (1316, 15951), (1636, 12831), (1833, 11452), (1974, 10634), (2444, 8589), (2454, 8554), (2863, 7332), (3666, 5726), (3948, 5317), (4277, 4908)]