21015520

素因数分解:

$2^5\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{223}}^1$

素因数の和:288

約数の個数: 96

約数和(自身を含む): 54190080

約数和(自身を除く): 33174560

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 31, 32, 38, 40, 62, 76, 80, 95, 124, 152, 155, 160, 190, 223, 248, 304, 310, 380, 446, 496, 589, 608, 620, 760, 892, 992, 1115, 1178, 1240, 1520, 1784, 2230, 2356, 2480, 2945, 3040, 3568, 4237, 4460, 4712, 4960, 5890, 6913, 7136, 8474, 8920, 9424, 11780, 13826, 16948, 17840, 18848, 21185, 23560, 27652, 33896, 34565, 35680, 42370, 47120, 55304, 67792, 69130, 84740, 94240, 110608, 131347, 135584, 138260, 169480, 221216, 262694, 276520, 338960, 525388, 553040, 656735, 677920, 1050776, 1106080, 1313470, 2101552, 2626940, 4203104, 5253880, 10507760, 21015520]

約数ペア:

[(1, 21015520), (2, 10507760), (4, 5253880), (5, 4203104), (8, 2626940), (10, 2101552), (16, 1313470), (19, 1106080), (20, 1050776), (31, 677920), (32, 656735), (38, 553040), (40, 525388), (62, 338960), (76, 276520), (80, 262694), (95, 221216), (124, 169480), (152, 138260), (155, 135584), (160, 131347), (190, 110608), (223, 94240), (248, 84740), (304, 69130), (310, 67792), (380, 55304), (446, 47120), (496, 42370), (589, 35680), (608, 34565), (620, 33896), (760, 27652), (892, 23560), (992, 21185), (1115, 18848), (1178, 17840), (1240, 16948), (1520, 13826), (1784, 11780), (2230, 9424), (2356, 8920), (2480, 8474), (2945, 7136), (3040, 6913), (3568, 5890), (4237, 4960), (4460, 4712)]