217871289

素因数分解:

$3^4\times {\mathrm{421}}^1\times {\mathrm{6389}}^1$

素因数の和:6822

約数の個数: 20

約数和(自身を含む): 326286180

約数和(自身を除く): 108414891

約数列:

[1, 3, 9, 27, 81, 421, 1263, 3789, 6389, 11367, 19167, 34101, 57501, 172503, 517509, 2689769, 8069307, 24207921, 72623763, 217871289]

約数ペア:

[(1, 217871289), (3, 72623763), (9, 24207921), (27, 8069307), (81, 2689769), (421, 517509), (1263, 172503), (3789, 57501), (6389, 34101), (11367, 19167)]