19990971

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{317}}^1$

素因数の和:361

約数の個数: 72

約数和(自身を含む): 39587184

約数和(自身を除く): 19596213

約数列:

[1, 3, 7, 9, 11, 13, 21, 33, 39, 49, 63, 77, 91, 99, 117, 143, 147, 231, 273, 317, 429, 441, 539, 637, 693, 819, 951, 1001, 1287, 1617, 1911, 2219, 2853, 3003, 3487, 4121, 4851, 5733, 6657, 7007, 9009, 10461, 12363, 15533, 19971, 21021, 24409, 28847, 31383, 37089, 45331, 46599, 63063, 73227, 86541, 135993, 139797, 170863, 201929, 219681, 259623, 317317, 407979, 512589, 605787, 951951, 1537767, 1817361, 2221219, 2855853, 6663657, 19990971]

約数ペア:

[(1, 19990971), (3, 6663657), (7, 2855853), (9, 2221219), (11, 1817361), (13, 1537767), (21, 951951), (33, 605787), (39, 512589), (49, 407979), (63, 317317), (77, 259623), (91, 219681), (99, 201929), (117, 170863), (143, 139797), (147, 135993), (231, 86541), (273, 73227), (317, 63063), (429, 46599), (441, 45331), (539, 37089), (637, 31383), (693, 28847), (819, 24409), (951, 21021), (1001, 19971), (1287, 15533), (1617, 12363), (1911, 10461), (2219, 9009), (2853, 7007), (3003, 6657), (3487, 5733), (4121, 4851)]