19989970

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{1997}}^1$

素因数の和:2035

約数の個数: 64

約数和(自身を含む): 48335616

約数和(自身を除く): 28345646

約数列:

[1, 2, 5, 7, 10, 11, 13, 14, 22, 26, 35, 55, 65, 70, 77, 91, 110, 130, 143, 154, 182, 286, 385, 455, 715, 770, 910, 1001, 1430, 1997, 2002, 3994, 5005, 9985, 10010, 13979, 19970, 21967, 25961, 27958, 43934, 51922, 69895, 109835, 129805, 139790, 153769, 181727, 219670, 259610, 285571, 307538, 363454, 571142, 768845, 908635, 1427855, 1537690, 1817270, 1998997, 2855710, 3997994, 9994985, 19989970]

約数ペア:

[(1, 19989970), (2, 9994985), (5, 3997994), (7, 2855710), (10, 1998997), (11, 1817270), (13, 1537690), (14, 1427855), (22, 908635), (26, 768845), (35, 571142), (55, 363454), (65, 307538), (70, 285571), (77, 259610), (91, 219670), (110, 181727), (130, 153769), (143, 139790), (154, 129805), (182, 109835), (286, 69895), (385, 51922), (455, 43934), (715, 27958), (770, 25961), (910, 21967), (1001, 19970), (1430, 13979), (1997, 10010), (2002, 9985), (3994, 5005)]