81281235568

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{390775171}}^1$

素因数の和:390775192

約数の個数: 20

約数和(自身を含む): 169596424648

約数和(自身を除く): 88315189080

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 390775171, 781550342, 1563100684, 3126201368, 5080077223, 6252402736, 10160154446, 20320308892, 40640617784, 81281235568]

約数ペア:

[(1, 81281235568), (2, 40640617784), (4, 20320308892), (8, 10160154446), (13, 6252402736), (16, 5080077223), (26, 3126201368), (52, 1563100684), (104, 781550342), (208, 390775171)]