21204080

素因数分解:

$2^4\times 5^1\times {\mathrm{239}}^1\times {\mathrm{1109}}^1$

素因数の和:1361

約数の個数: 40

約数和(自身を含む): 49550400

約数和(自身を除く): 28346320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 239, 478, 956, 1109, 1195, 1912, 2218, 2390, 3824, 4436, 4780, 5545, 8872, 9560, 11090, 17744, 19120, 22180, 44360, 88720, 265051, 530102, 1060204, 1325255, 2120408, 2650510, 4240816, 5301020, 10602040, 21204080]

約数ペア:

[(1, 21204080), (2, 10602040), (4, 5301020), (5, 4240816), (8, 2650510), (10, 2120408), (16, 1325255), (20, 1060204), (40, 530102), (80, 265051), (239, 88720), (478, 44360), (956, 22180), (1109, 19120), (1195, 17744), (1912, 11090), (2218, 9560), (2390, 8872), (3824, 5545), (4436, 4780)]