20604987

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1$

素因数の和:105

約数の個数: 72

約数和(自身を含む): 36541440

約数和(自身を除く): 15936453

約数列:

[1, 3, 9, 13, 19, 23, 31, 39, 57, 69, 93, 117, 169, 171, 207, 247, 279, 299, 403, 437, 507, 589, 713, 741, 897, 1209, 1311, 1521, 1767, 2139, 2223, 2691, 3211, 3627, 3887, 3933, 5239, 5301, 5681, 6417, 7657, 9269, 9633, 11661, 13547, 15717, 17043, 22971, 27807, 28899, 34983, 40641, 47151, 51129, 68913, 73853, 83421, 99541, 120497, 121923, 176111, 221559, 298623, 361491, 528333, 664677, 895869, 1084473, 1584999, 2289443, 6868329, 20604987]

約数ペア:

[(1, 20604987), (3, 6868329), (9, 2289443), (13, 1584999), (19, 1084473), (23, 895869), (31, 664677), (39, 528333), (57, 361491), (69, 298623), (93, 221559), (117, 176111), (169, 121923), (171, 120497), (207, 99541), (247, 83421), (279, 73853), (299, 68913), (403, 51129), (437, 47151), (507, 40641), (589, 34983), (713, 28899), (741, 27807), (897, 22971), (1209, 17043), (1311, 15717), (1521, 13547), (1767, 11661), (2139, 9633), (2223, 9269), (2691, 7657), (3211, 6417), (3627, 5681), (3887, 5301), (3933, 5239)]