21207897

素因数分解:

$3^2\times {\mathrm{53}}^1\times {\mathrm{173}}^1\times {\mathrm{257}}^1$

素因数の和:489

約数の個数: 24

約数和(自身を含む): 31514184

約数和(自身を除く): 10306287

約数列:

[1, 3, 9, 53, 159, 173, 257, 477, 519, 771, 1557, 2313, 9169, 13621, 27507, 40863, 44461, 82521, 122589, 133383, 400149, 2356433, 7069299, 21207897]

約数ペア:

[(1, 21207897), (3, 7069299), (9, 2356433), (53, 400149), (159, 133383), (173, 122589), (257, 82521), (477, 44461), (519, 40863), (771, 27507), (1557, 13621), (2313, 9169)]