21186520

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{457}}^1$

素因数の和:548

約数の個数: 64

約数和(自身を含む): 51112800

約数和(自身を除く): 29926280

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 61, 76, 95, 122, 152, 190, 244, 305, 380, 457, 488, 610, 760, 914, 1159, 1220, 1828, 2285, 2318, 2440, 3656, 4570, 4636, 5795, 8683, 9140, 9272, 11590, 17366, 18280, 23180, 27877, 34732, 43415, 46360, 55754, 69464, 86830, 111508, 139385, 173660, 223016, 278770, 347320, 529663, 557540, 1059326, 1115080, 2118652, 2648315, 4237304, 5296630, 10593260, 21186520]

約数ペア:

[(1, 21186520), (2, 10593260), (4, 5296630), (5, 4237304), (8, 2648315), (10, 2118652), (19, 1115080), (20, 1059326), (38, 557540), (40, 529663), (61, 347320), (76, 278770), (95, 223016), (122, 173660), (152, 139385), (190, 111508), (244, 86830), (305, 69464), (380, 55754), (457, 46360), (488, 43415), (610, 34732), (760, 27877), (914, 23180), (1159, 18280), (1220, 17366), (1828, 11590), (2285, 9272), (2318, 9140), (2440, 8683), (3656, 5795), (4570, 4636)]