20879080

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:314

約数の個数: 64

約数和(自身を含む): 49104000

約数和(自身を除く): 28224920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 61, 86, 122, 172, 199, 215, 244, 305, 344, 398, 430, 488, 610, 796, 860, 995, 1220, 1592, 1720, 1990, 2440, 2623, 3980, 5246, 7960, 8557, 10492, 12139, 13115, 17114, 20984, 24278, 26230, 34228, 42785, 48556, 52460, 60695, 68456, 85570, 97112, 104920, 121390, 171140, 242780, 342280, 485560, 521977, 1043954, 2087908, 2609885, 4175816, 5219770, 10439540, 20879080]

約数ペア:

[(1, 20879080), (2, 10439540), (4, 5219770), (5, 4175816), (8, 2609885), (10, 2087908), (20, 1043954), (40, 521977), (43, 485560), (61, 342280), (86, 242780), (122, 171140), (172, 121390), (199, 104920), (215, 97112), (244, 85570), (305, 68456), (344, 60695), (398, 52460), (430, 48556), (488, 42785), (610, 34228), (796, 26230), (860, 24278), (995, 20984), (1220, 17114), (1592, 13115), (1720, 12139), (1990, 10492), (2440, 8557), (2623, 7960), (3980, 5246)]