21218320

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6469}}^1$

素因数の和:6523

約数の個数: 40

約数和(自身を含む): 50543640

約数和(自身を除く): 29325320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6469, 12938, 25876, 32345, 51752, 64690, 103504, 129380, 258760, 265229, 517520, 530458, 1060916, 1326145, 2121832, 2652290, 4243664, 5304580, 10609160, 21218320]

約数ペア:

[(1, 21218320), (2, 10609160), (4, 5304580), (5, 4243664), (8, 2652290), (10, 2121832), (16, 1326145), (20, 1060916), (40, 530458), (41, 517520), (80, 265229), (82, 258760), (164, 129380), (205, 103504), (328, 64690), (410, 51752), (656, 32345), (820, 25876), (1640, 12938), (3280, 6469)]