18901940

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{709}}^1$

素因数の和:792

約数の個数: 48

約数和(自身を含む): 41986560

約数和(自身を除く): 23084620

約数列:

[1, 2, 4, 5, 10, 20, 31, 43, 62, 86, 124, 155, 172, 215, 310, 430, 620, 709, 860, 1333, 1418, 2666, 2836, 3545, 5332, 6665, 7090, 13330, 14180, 21979, 26660, 30487, 43958, 60974, 87916, 109895, 121948, 152435, 219790, 304870, 439580, 609740, 945097, 1890194, 3780388, 4725485, 9450970, 18901940]

約数ペア:

[(1, 18901940), (2, 9450970), (4, 4725485), (5, 3780388), (10, 1890194), (20, 945097), (31, 609740), (43, 439580), (62, 304870), (86, 219790), (124, 152435), (155, 121948), (172, 109895), (215, 87916), (310, 60974), (430, 43958), (620, 30487), (709, 26660), (860, 21979), (1333, 14180), (1418, 13330), (2666, 7090), (2836, 6665), (3545, 5332)]