21353815

素因数分解:

$5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{163}}^1\times {\mathrm{197}}^1$

素因数の和:391

約数の個数: 32

約数和(自身を含む): 31173120

約数和(自身を除く): 9819305

約数列:

[1, 5, 7, 19, 35, 95, 133, 163, 197, 665, 815, 985, 1141, 1379, 3097, 3743, 5705, 6895, 15485, 18715, 21679, 26201, 32111, 108395, 131005, 160555, 224777, 610109, 1123885, 3050545, 4270763, 21353815]

約数ペア:

[(1, 21353815), (5, 4270763), (7, 3050545), (19, 1123885), (35, 610109), (95, 224777), (133, 160555), (163, 131005), (197, 108395), (665, 32111), (815, 26201), (985, 21679), (1141, 18715), (1379, 15485), (3097, 6895), (3743, 5705)]