81291990

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{208441}}^1$

素因数の和:208464

約数の個数: 32

約数和(自身を含む): 210109536

約数和(自身を除く): 128817546

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 208441, 416882, 625323, 1042205, 1250646, 2084410, 2709733, 3126615, 5419466, 6253230, 8129199, 13548665, 16258398, 27097330, 40645995, 81291990]

約数ペア:

[(1, 81291990), (2, 40645995), (3, 27097330), (5, 16258398), (6, 13548665), (10, 8129199), (13, 6253230), (15, 5419466), (26, 3126615), (30, 2709733), (39, 2084410), (65, 1250646), (78, 1042205), (130, 625323), (195, 416882), (390, 208441)]