20668505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{211}}^1$

素因数の和:377

約数の個数: 32

約数和(自身を含む): 29490048

約数和(自身を除く): 8821543

約数列:

[1, 5, 11, 13, 55, 65, 137, 143, 211, 685, 715, 1055, 1507, 1781, 2321, 2743, 7535, 8905, 11605, 13715, 19591, 28907, 30173, 97955, 144535, 150865, 317977, 375791, 1589885, 1878955, 4133701, 20668505]

約数ペア:

[(1, 20668505), (5, 4133701), (11, 1878955), (13, 1589885), (55, 375791), (65, 317977), (137, 150865), (143, 144535), (211, 97955), (685, 30173), (715, 28907), (1055, 19591), (1507, 13715), (1781, 11605), (2321, 8905), (2743, 7535)]