21257960

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{83}}^1\times {\mathrm{337}}^1$

素因数の和:450

約数の個数: 64

約数和(自身を含む): 51105600

約数和(自身を除く): 29847640

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 83, 95, 152, 166, 190, 332, 337, 380, 415, 664, 674, 760, 830, 1348, 1577, 1660, 1685, 2696, 3154, 3320, 3370, 6308, 6403, 6740, 7885, 12616, 12806, 13480, 15770, 25612, 27971, 31540, 32015, 51224, 55942, 63080, 64030, 111884, 128060, 139855, 223768, 256120, 279710, 531449, 559420, 1062898, 1118840, 2125796, 2657245, 4251592, 5314490, 10628980, 21257960]

約数ペア:

[(1, 21257960), (2, 10628980), (4, 5314490), (5, 4251592), (8, 2657245), (10, 2125796), (19, 1118840), (20, 1062898), (38, 559420), (40, 531449), (76, 279710), (83, 256120), (95, 223768), (152, 139855), (166, 128060), (190, 111884), (332, 64030), (337, 63080), (380, 55942), (415, 51224), (664, 32015), (674, 31540), (760, 27971), (830, 25612), (1348, 15770), (1577, 13480), (1660, 12806), (1685, 12616), (2696, 7885), (3154, 6740), (3320, 6403), (3370, 6308)]