81287900

素因数分解:

$2^2\times 5^2\times {\mathrm{71}}^1\times {\mathrm{107}}^2$

素因数の和:299

約数の個数: 54

約数和(自身を含む): 180566568

約数和(自身を除く): 99278668

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 71, 100, 107, 142, 214, 284, 355, 428, 535, 710, 1070, 1420, 1775, 2140, 2675, 3550, 5350, 7100, 7597, 10700, 11449, 15194, 22898, 30388, 37985, 45796, 57245, 75970, 114490, 151940, 189925, 228980, 286225, 379850, 572450, 759700, 812879, 1144900, 1625758, 3251516, 4064395, 8128790, 16257580, 20321975, 40643950, 81287900]

約数ペア:

[(1, 81287900), (2, 40643950), (4, 20321975), (5, 16257580), (10, 8128790), (20, 4064395), (25, 3251516), (50, 1625758), (71, 1144900), (100, 812879), (107, 759700), (142, 572450), (214, 379850), (284, 286225), (355, 228980), (428, 189925), (535, 151940), (710, 114490), (1070, 75970), (1420, 57245), (1775, 45796), (2140, 37985), (2675, 30388), (3550, 22898), (5350, 15194), (7100, 11449), (7597, 10700)]