12720890

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1997}}^1$

素因数の和:2031

約数の個数: 48

約数和(自身を含む): 28699272

約数和(自身を除く): 15978382

約数列:

[1, 2, 5, 7, 10, 13, 14, 26, 35, 49, 65, 70, 91, 98, 130, 182, 245, 455, 490, 637, 910, 1274, 1997, 3185, 3994, 6370, 9985, 13979, 19970, 25961, 27958, 51922, 69895, 97853, 129805, 139790, 181727, 195706, 259610, 363454, 489265, 908635, 978530, 1272089, 1817270, 2544178, 6360445, 12720890]

約数ペア:

[(1, 12720890), (2, 6360445), (5, 2544178), (7, 1817270), (10, 1272089), (13, 978530), (14, 908635), (26, 489265), (35, 363454), (49, 259610), (65, 195706), (70, 181727), (91, 139790), (98, 129805), (130, 97853), (182, 69895), (245, 51922), (455, 27958), (490, 25961), (637, 19970), (910, 13979), (1274, 9985), (1997, 6370), (3185, 3994)]