20720518

素因数分解:

$2^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{181}}^1$

素因数の和:257

約数の個数: 64

約数和(自身を含む): 41827968

約数和(自身を除く): 21107450

約数列:

[1, 2, 7, 13, 14, 17, 26, 34, 37, 74, 91, 119, 181, 182, 221, 238, 259, 362, 442, 481, 518, 629, 962, 1258, 1267, 1547, 2353, 2534, 3077, 3094, 3367, 4403, 4706, 6154, 6697, 6734, 8177, 8806, 13394, 16354, 16471, 21539, 32942, 40001, 43078, 46879, 57239, 80002, 87061, 93758, 113849, 114478, 174122, 227698, 280007, 560014, 609427, 796943, 1218854, 1480037, 1593886, 2960074, 10360259, 20720518]

約数ペア:

[(1, 20720518), (2, 10360259), (7, 2960074), (13, 1593886), (14, 1480037), (17, 1218854), (26, 796943), (34, 609427), (37, 560014), (74, 280007), (91, 227698), (119, 174122), (181, 114478), (182, 113849), (221, 93758), (238, 87061), (259, 80002), (362, 57239), (442, 46879), (481, 43078), (518, 40001), (629, 32942), (962, 21539), (1258, 16471), (1267, 16354), (1547, 13394), (2353, 8806), (2534, 8177), (3077, 6734), (3094, 6697), (3367, 6154), (4403, 4706)]