128539820

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1\times {\mathrm{691}}^1$

素因数の和:902

約数の個数: 48

約数和(自身を含む): 276224256

約数和(自身を除く): 147684436

約数列:

[1, 2, 4, 5, 10, 20, 71, 131, 142, 262, 284, 355, 524, 655, 691, 710, 1310, 1382, 1420, 2620, 2764, 3455, 6910, 9301, 13820, 18602, 37204, 46505, 49061, 90521, 93010, 98122, 181042, 186020, 196244, 245305, 362084, 452605, 490610, 905210, 981220, 1810420, 6426991, 12853982, 25707964, 32134955, 64269910, 128539820]

約数ペア:

[(1, 128539820), (2, 64269910), (4, 32134955), (5, 25707964), (10, 12853982), (20, 6426991), (71, 1810420), (131, 981220), (142, 905210), (262, 490610), (284, 452605), (355, 362084), (524, 245305), (655, 196244), (691, 186020), (710, 181042), (1310, 98122), (1382, 93010), (1420, 90521), (2620, 49061), (2764, 46505), (3455, 37204), (6910, 18602), (9301, 13820)]