21139209

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{487}}^1$

素因数の和:566

約数の個数: 48

約数和(自身を含む): 38368512

約数和(自身を除く): 17229303

約数列:

[1, 3, 7, 9, 13, 21, 39, 53, 63, 91, 117, 159, 273, 371, 477, 487, 689, 819, 1113, 1461, 2067, 3339, 3409, 4383, 4823, 6201, 6331, 10227, 14469, 18993, 25811, 30681, 43407, 44317, 56979, 77433, 132951, 180677, 232299, 335543, 398853, 542031, 1006629, 1626093, 2348801, 3019887, 7046403, 21139209]

約数ペア:

[(1, 21139209), (3, 7046403), (7, 3019887), (9, 2348801), (13, 1626093), (21, 1006629), (39, 542031), (53, 398853), (63, 335543), (91, 232299), (117, 180677), (159, 132951), (273, 77433), (371, 56979), (477, 44317), (487, 43407), (689, 30681), (819, 25811), (1113, 18993), (1461, 14469), (2067, 10227), (3339, 6331), (3409, 6201), (4383, 4823)]