638565590

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{193}}^1\times {\mathrm{821}}^1$

素因数の和:1065

約数の個数: 64

約数和(自身を含む): 1285949952

約数和(自身を除く): 647384362

約数列:

[1, 2, 5, 10, 13, 26, 31, 62, 65, 130, 155, 193, 310, 386, 403, 806, 821, 965, 1642, 1930, 2015, 2509, 4030, 4105, 5018, 5983, 8210, 10673, 11966, 12545, 21346, 25090, 25451, 29915, 50902, 53365, 59830, 77779, 106730, 127255, 155558, 158453, 254510, 316906, 330863, 388895, 661726, 777790, 792265, 1584530, 1654315, 2059889, 3308630, 4119778, 4912043, 9824086, 10299445, 20598890, 24560215, 49120430, 63856559, 127713118, 319282795, 638565590]

約数ペア:

[(1, 638565590), (2, 319282795), (5, 127713118), (10, 63856559), (13, 49120430), (26, 24560215), (31, 20598890), (62, 10299445), (65, 9824086), (130, 4912043), (155, 4119778), (193, 3308630), (310, 2059889), (386, 1654315), (403, 1584530), (806, 792265), (821, 777790), (965, 661726), (1642, 388895), (1930, 330863), (2015, 316906), (2509, 254510), (4030, 158453), (4105, 155558), (5018, 127255), (5983, 106730), (8210, 77779), (10673, 59830), (11966, 53365), (12545, 50902), (21346, 29915), (25090, 25451)]