19966960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{263}}^1$

素因数の和:362

約数の個数: 80

約数和(自身を含む): 50871744

約数和(自身を除く): 30904784

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 73, 80, 104, 130, 146, 208, 260, 263, 292, 365, 520, 526, 584, 730, 949, 1040, 1052, 1168, 1315, 1460, 1898, 2104, 2630, 2920, 3419, 3796, 4208, 4745, 5260, 5840, 6838, 7592, 9490, 10520, 13676, 15184, 17095, 18980, 19199, 21040, 27352, 34190, 37960, 38398, 54704, 68380, 75920, 76796, 95995, 136760, 153592, 191990, 249587, 273520, 307184, 383980, 499174, 767960, 998348, 1247935, 1535920, 1996696, 2495870, 3993392, 4991740, 9983480, 19966960]

約数ペア:

[(1, 19966960), (2, 9983480), (4, 4991740), (5, 3993392), (8, 2495870), (10, 1996696), (13, 1535920), (16, 1247935), (20, 998348), (26, 767960), (40, 499174), (52, 383980), (65, 307184), (73, 273520), (80, 249587), (104, 191990), (130, 153592), (146, 136760), (208, 95995), (260, 76796), (263, 75920), (292, 68380), (365, 54704), (520, 38398), (526, 37960), (584, 34190), (730, 27352), (949, 21040), (1040, 19199), (1052, 18980), (1168, 17095), (1315, 15184), (1460, 13676), (1898, 10520), (2104, 9490), (2630, 7592), (2920, 6838), (3419, 5840), (3796, 5260), (4208, 4745)]