20528991

素因数分解:

$3^3\times 7^2\times {\mathrm{59}}^1\times {\mathrm{263}}^1$

素因数の和:345

約数の個数: 48

約数和(自身を含む): 36115200

約数和(自身を除く): 15586209

約数列:

[1, 3, 7, 9, 21, 27, 49, 59, 63, 147, 177, 189, 263, 413, 441, 531, 789, 1239, 1323, 1593, 1841, 2367, 2891, 3717, 5523, 7101, 8673, 11151, 12887, 15517, 16569, 26019, 38661, 46551, 49707, 78057, 108619, 115983, 139653, 325857, 347949, 418959, 760333, 977571, 2280999, 2932713, 6842997, 20528991]

約数ペア:

[(1, 20528991), (3, 6842997), (7, 2932713), (9, 2280999), (21, 977571), (27, 760333), (49, 418959), (59, 347949), (63, 325857), (147, 139653), (177, 115983), (189, 108619), (263, 78057), (413, 49707), (441, 46551), (531, 38661), (789, 26019), (1239, 16569), (1323, 15517), (1593, 12887), (1841, 11151), (2367, 8673), (2891, 7101), (3717, 5523)]