81677820

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{194471}}^1$

素因数の和:194490

約数の個数: 48

約数和(自身を含む): 261370368

約数和(自身を除く): 179692548

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 194471, 388942, 583413, 777884, 972355, 1166826, 1361297, 1944710, 2333652, 2722594, 2917065, 3889420, 4083891, 5445188, 5834130, 6806485, 8167782, 11668260, 13612970, 16335564, 20419455, 27225940, 40838910, 81677820]

約数ペア:

[(1, 81677820), (2, 40838910), (3, 27225940), (4, 20419455), (5, 16335564), (6, 13612970), (7, 11668260), (10, 8167782), (12, 6806485), (14, 5834130), (15, 5445188), (20, 4083891), (21, 3889420), (28, 2917065), (30, 2722594), (35, 2333652), (42, 1944710), (60, 1361297), (70, 1166826), (84, 972355), (105, 777884), (140, 583413), (210, 388942), (420, 194471)]