81980275

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:236

約数の個数: 48

約数和(自身を含む): 115548160

約数和(自身を除く): 33567885

約数列:

[1, 5, 13, 25, 31, 65, 79, 103, 155, 325, 395, 403, 515, 775, 1027, 1339, 1975, 2015, 2449, 2575, 3193, 5135, 6695, 8137, 10075, 12245, 15965, 25675, 31837, 33475, 40685, 41509, 61225, 79825, 105781, 159185, 203425, 207545, 252247, 528905, 795925, 1037725, 1261235, 2644525, 3279211, 6306175, 16396055, 81980275]

約数ペア:

[(1, 81980275), (5, 16396055), (13, 6306175), (25, 3279211), (31, 2644525), (65, 1261235), (79, 1037725), (103, 795925), (155, 528905), (325, 252247), (395, 207545), (403, 203425), (515, 159185), (775, 105781), (1027, 79825), (1339, 61225), (1975, 41509), (2015, 40685), (2449, 33475), (2575, 31837), (3193, 25675), (5135, 15965), (6695, 12245), (8137, 10075)]