20921392

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{647}}^1$

素因数の和:745

約数の個数: 40

約数和(自身を含む): 42425856

約数和(自身を除く): 21504464

約数列:

[1, 2, 4, 8, 16, 43, 47, 86, 94, 172, 188, 344, 376, 647, 688, 752, 1294, 2021, 2588, 4042, 5176, 8084, 10352, 16168, 27821, 30409, 32336, 55642, 60818, 111284, 121636, 222568, 243272, 445136, 486544, 1307587, 2615174, 5230348, 10460696, 20921392]

約数ペア:

[(1, 20921392), (2, 10460696), (4, 5230348), (8, 2615174), (16, 1307587), (43, 486544), (47, 445136), (86, 243272), (94, 222568), (172, 121636), (188, 111284), (344, 60818), (376, 55642), (647, 32336), (688, 30409), (752, 27821), (1294, 16168), (2021, 10352), (2588, 8084), (4042, 5176)]