19998980

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^3\times {\mathrm{41}}^1$

素因数の和:137

約数の個数: 48

約数和(自身を含む): 44558640

約数和(自身を除く): 24559660

約数列:

[1, 2, 4, 5, 10, 20, 29, 41, 58, 82, 116, 145, 164, 205, 290, 410, 580, 820, 841, 1189, 1682, 2378, 3364, 4205, 4756, 5945, 8410, 11890, 16820, 23780, 24389, 34481, 48778, 68962, 97556, 121945, 137924, 172405, 243890, 344810, 487780, 689620, 999949, 1999898, 3999796, 4999745, 9999490, 19998980]

約数ペア:

[(1, 19998980), (2, 9999490), (4, 4999745), (5, 3999796), (10, 1999898), (20, 999949), (29, 689620), (41, 487780), (58, 344810), (82, 243890), (116, 172405), (145, 137924), (164, 121945), (205, 97556), (290, 68962), (410, 48778), (580, 34481), (820, 24389), (841, 23780), (1189, 16820), (1682, 11890), (2378, 8410), (3364, 5945), (4205, 4756)]