20809960

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12689}}^1$

素因数の和:12741

約数の個数: 32

約数和(自身を含む): 47968200

約数和(自身を除く): 27158240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12689, 25378, 50756, 63445, 101512, 126890, 253780, 507560, 520249, 1040498, 2080996, 2601245, 4161992, 5202490, 10404980, 20809960]

約数ペア:

[(1, 20809960), (2, 10404980), (4, 5202490), (5, 4161992), (8, 2601245), (10, 2080996), (20, 1040498), (40, 520249), (41, 507560), (82, 253780), (164, 126890), (205, 101512), (328, 63445), (410, 50756), (820, 25378), (1640, 12689)]