20498320

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{997}}^1$

素因数の和:1267

約数の個数: 40

約数和(自身を含む): 47892024

約数和(自身を除く): 27393704

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 997, 1028, 1285, 1994, 2056, 2570, 3988, 4112, 4985, 5140, 7976, 9970, 10280, 15952, 19940, 20560, 39880, 79760, 256229, 512458, 1024916, 1281145, 2049832, 2562290, 4099664, 5124580, 10249160, 20498320]

約数ペア:

[(1, 20498320), (2, 10249160), (4, 5124580), (5, 4099664), (8, 2562290), (10, 2049832), (16, 1281145), (20, 1024916), (40, 512458), (80, 256229), (257, 79760), (514, 39880), (997, 20560), (1028, 19940), (1285, 15952), (1994, 10280), (2056, 9970), (2570, 7976), (3988, 5140), (4112, 4985)]