21015995

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1$

素因数の和:85

約数の個数: 96

約数和(自身を含む): 37946880

約数和(自身を除く): 16930885

約数列:

[1, 5, 7, 11, 13, 17, 19, 35, 55, 65, 77, 85, 91, 95, 119, 133, 143, 169, 187, 209, 221, 247, 323, 385, 455, 595, 665, 715, 845, 935, 1001, 1045, 1105, 1183, 1235, 1309, 1463, 1547, 1615, 1729, 1859, 2261, 2431, 2717, 2873, 3211, 3553, 4199, 5005, 5915, 6545, 7315, 7735, 8645, 9295, 11305, 12155, 13013, 13585, 14365, 16055, 17017, 17765, 19019, 20111, 20995, 22477, 24871, 29393, 31603, 35321, 46189, 54587, 65065, 85085, 95095, 100555, 112385, 124355, 146965, 158015, 176605, 221221, 230945, 247247, 272935, 323323, 382109, 600457, 1106105, 1236235, 1616615, 1910545, 3002285, 4203199, 21015995]

約数ペア:

[(1, 21015995), (5, 4203199), (7, 3002285), (11, 1910545), (13, 1616615), (17, 1236235), (19, 1106105), (35, 600457), (55, 382109), (65, 323323), (77, 272935), (85, 247247), (91, 230945), (95, 221221), (119, 176605), (133, 158015), (143, 146965), (169, 124355), (187, 112385), (209, 100555), (221, 95095), (247, 85085), (323, 65065), (385, 54587), (455, 46189), (595, 35321), (665, 31603), (715, 29393), (845, 24871), (935, 22477), (1001, 20995), (1045, 20111), (1105, 19019), (1183, 17765), (1235, 17017), (1309, 16055), (1463, 14365), (1547, 13585), (1615, 13013), (1729, 12155), (1859, 11305), (2261, 9295), (2431, 8645), (2717, 7735), (2873, 7315), (3211, 6545), (3553, 5915), (4199, 5005)]