19738940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^2\times {\mathrm{79}}^1$

素因数の和:163

約数の個数: 72

約数和(自身を含む): 46710720

約数和(自身を除く): 26971780

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 79, 124, 130, 155, 158, 260, 310, 316, 395, 403, 620, 790, 806, 961, 1027, 1580, 1612, 1922, 2015, 2054, 2449, 3844, 4030, 4108, 4805, 4898, 5135, 8060, 9610, 9796, 10270, 12245, 12493, 19220, 20540, 24490, 24986, 31837, 48980, 49972, 62465, 63674, 75919, 124930, 127348, 151838, 159185, 249860, 303676, 318370, 379595, 636740, 759190, 986947, 1518380, 1973894, 3947788, 4934735, 9869470, 19738940]

約数ペア:

[(1, 19738940), (2, 9869470), (4, 4934735), (5, 3947788), (10, 1973894), (13, 1518380), (20, 986947), (26, 759190), (31, 636740), (52, 379595), (62, 318370), (65, 303676), (79, 249860), (124, 159185), (130, 151838), (155, 127348), (158, 124930), (260, 75919), (310, 63674), (316, 62465), (395, 49972), (403, 48980), (620, 31837), (790, 24986), (806, 24490), (961, 20540), (1027, 19220), (1580, 12493), (1612, 12245), (1922, 10270), (2015, 9796), (2054, 9610), (2449, 8060), (3844, 5135), (4030, 4898), (4108, 4805)]