20016993880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1\times {\mathrm{9479}}^1$

素因数の和:9665

約数の個数: 128

約数和(自身を含む): 50454835200

約数和(自身を除く): 30437841320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 131, 155, 248, 260, 262, 310, 403, 520, 524, 620, 655, 806, 1048, 1240, 1310, 1612, 1703, 2015, 2620, 3224, 3406, 4030, 4061, 5240, 6812, 8060, 8122, 8515, 9479, 13624, 16120, 16244, 17030, 18958, 20305, 32488, 34060, 37916, 40610, 47395, 52793, 68120, 75832, 81220, 94790, 105586, 123227, 162440, 189580, 211172, 246454, 263965, 293849, 379160, 422344, 492908, 527930, 587698, 616135, 985816, 1055860, 1175396, 1232270, 1241749, 1469245, 2111720, 2350792, 2464540, 2483498, 2938490, 3820037, 4929080, 4966996, 5876980, 6208745, 7640074, 9933992, 11753960, 12417490, 15280148, 16142737, 19100185, 24834980, 30560296, 32285474, 38200370, 38494219, 49669960, 64570948, 76400740, 76988438, 80713685, 129141896, 152801480, 153976876, 161427370, 192471095, 307953752, 322854740, 384942190, 500424847, 645709480, 769884380, 1000849694, 1539768760, 2001699388, 2502124235, 4003398776, 5004248470, 10008496940, 20016993880]

約数ペア:

[(1, 20016993880), (2, 10008496940), (4, 5004248470), (5, 4003398776), (8, 2502124235), (10, 2001699388), (13, 1539768760), (20, 1000849694), (26, 769884380), (31, 645709480), (40, 500424847), (52, 384942190), (62, 322854740), (65, 307953752), (104, 192471095), (124, 161427370), (130, 153976876), (131, 152801480), (155, 129141896), (248, 80713685), (260, 76988438), (262, 76400740), (310, 64570948), (403, 49669960), (520, 38494219), (524, 38200370), (620, 32285474), (655, 30560296), (806, 24834980), (1048, 19100185), (1240, 16142737), (1310, 15280148), (1612, 12417490), (1703, 11753960), (2015, 9933992), (2620, 7640074), (3224, 6208745), (3406, 5876980), (4030, 4966996), (4061, 4929080), (5240, 3820037), (6812, 2938490), (8060, 2483498), (8122, 2464540), (8515, 2350792), (9479, 2111720), (13624, 1469245), (16120, 1241749), (16244, 1232270), (17030, 1175396), (18958, 1055860), (20305, 985816), (32488, 616135), (34060, 587698), (37916, 527930), (40610, 492908), (47395, 422344), (52793, 379160), (68120, 293849), (75832, 263965), (81220, 246454), (94790, 211172), (105586, 189580), (123227, 162440)]