21780220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{14143}}^1$

素因数の和:14170

約数の個数: 48

約数和(自身を含む): 57028608

約数和(自身を除く): 35248388

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 14143, 28286, 56572, 70715, 99001, 141430, 155573, 198002, 282860, 311146, 396004, 495005, 622292, 777865, 990010, 1089011, 1555730, 1980020, 2178022, 3111460, 4356044, 5445055, 10890110, 21780220]

約数ペア:

[(1, 21780220), (2, 10890110), (4, 5445055), (5, 4356044), (7, 3111460), (10, 2178022), (11, 1980020), (14, 1555730), (20, 1089011), (22, 990010), (28, 777865), (35, 622292), (44, 495005), (55, 396004), (70, 311146), (77, 282860), (110, 198002), (140, 155573), (154, 141430), (220, 99001), (308, 70715), (385, 56572), (770, 28286), (1540, 14143)]