21038775

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{569}}^1$

素因数の和:628

約数の個数: 48

約数和(自身を含む): 38167200

約数和(自身を除く): 17128425

約数列:

[1, 3, 5, 15, 17, 25, 29, 51, 75, 85, 87, 145, 255, 425, 435, 493, 569, 725, 1275, 1479, 1707, 2175, 2465, 2845, 7395, 8535, 9673, 12325, 14225, 16501, 29019, 36975, 42675, 48365, 49503, 82505, 145095, 241825, 247515, 280517, 412525, 725475, 841551, 1237575, 1402585, 4207755, 7012925, 21038775]

約数ペア:

[(1, 21038775), (3, 7012925), (5, 4207755), (15, 1402585), (17, 1237575), (25, 841551), (29, 725475), (51, 412525), (75, 280517), (85, 247515), (87, 241825), (145, 145095), (255, 82505), (425, 49503), (435, 48365), (493, 42675), (569, 36975), (725, 29019), (1275, 16501), (1479, 14225), (1707, 12325), (2175, 9673), (2465, 8535), (2845, 7395)]