20961640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{1741}}^1$

素因数の和:1802

約数の個数: 64

約数和(自身を含む): 55186560

約数和(自身を除く): 34224920

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 43, 56, 70, 86, 140, 172, 215, 280, 301, 344, 430, 602, 860, 1204, 1505, 1720, 1741, 2408, 3010, 3482, 6020, 6964, 8705, 12040, 12187, 13928, 17410, 24374, 34820, 48748, 60935, 69640, 74863, 97496, 121870, 149726, 243740, 299452, 374315, 487480, 524041, 598904, 748630, 1048082, 1497260, 2096164, 2620205, 2994520, 4192328, 5240410, 10480820, 20961640]

約数ペア:

[(1, 20961640), (2, 10480820), (4, 5240410), (5, 4192328), (7, 2994520), (8, 2620205), (10, 2096164), (14, 1497260), (20, 1048082), (28, 748630), (35, 598904), (40, 524041), (43, 487480), (56, 374315), (70, 299452), (86, 243740), (140, 149726), (172, 121870), (215, 97496), (280, 74863), (301, 69640), (344, 60935), (430, 48748), (602, 34820), (860, 24374), (1204, 17410), (1505, 13928), (1720, 12187), (1741, 12040), (2408, 8705), (3010, 6964), (3482, 6020)]