19902155

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1$

素因数の和:156

約数の個数: 64

約数和(自身を含む): 32514048

約数和(自身を除く): 12611893

約数列:

[1, 5, 7, 13, 17, 31, 35, 65, 83, 85, 91, 119, 155, 217, 221, 403, 415, 455, 527, 581, 595, 1079, 1085, 1105, 1411, 1547, 2015, 2573, 2635, 2821, 2905, 3689, 5395, 6851, 7055, 7553, 7735, 9877, 12865, 14105, 18011, 18343, 18445, 33449, 34255, 37765, 43741, 47957, 49385, 90055, 91715, 128401, 167245, 218705, 234143, 239785, 306187, 568633, 642005, 1170715, 1530935, 2843165, 3980431, 19902155]

約数ペア:

[(1, 19902155), (5, 3980431), (7, 2843165), (13, 1530935), (17, 1170715), (31, 642005), (35, 568633), (65, 306187), (83, 239785), (85, 234143), (91, 218705), (119, 167245), (155, 128401), (217, 91715), (221, 90055), (403, 49385), (415, 47957), (455, 43741), (527, 37765), (581, 34255), (595, 33449), (1079, 18445), (1085, 18343), (1105, 18011), (1411, 14105), (1547, 12865), (2015, 9877), (2573, 7735), (2635, 7553), (2821, 7055), (2905, 6851), (3689, 5395)]