81387775

素因数分解:

$5^2\times 7^2\times {\mathrm{29}}^2\times {\mathrm{79}}^1$

素因数の和:161

約数の個数: 54

約数和(自身を含む): 123124560

約数和(自身を除く): 41736785

約数列:

[1, 5, 7, 25, 29, 35, 49, 79, 145, 175, 203, 245, 395, 553, 725, 841, 1015, 1225, 1421, 1975, 2291, 2765, 3871, 4205, 5075, 5887, 7105, 11455, 13825, 16037, 19355, 21025, 29435, 35525, 41209, 57275, 66439, 80185, 96775, 112259, 147175, 206045, 332195, 400925, 465073, 561295, 1030225, 1660975, 2325365, 2806475, 3255511, 11626825, 16277555, 81387775]

約数ペア:

[(1, 81387775), (5, 16277555), (7, 11626825), (25, 3255511), (29, 2806475), (35, 2325365), (49, 1660975), (79, 1030225), (145, 561295), (175, 465073), (203, 400925), (245, 332195), (395, 206045), (553, 147175), (725, 112259), (841, 96775), (1015, 80185), (1225, 66439), (1421, 57275), (1975, 41209), (2291, 35525), (2765, 29435), (3871, 21025), (4205, 19355), (5075, 16037), (5887, 13825), (7105, 11455)]