81131980

素因数分解:

$2^2\times 5^1\times {\mathrm{271}}^1\times {\mathrm{14969}}^1$

素因数の和:15249

約数の個数: 24

約数和(自身を含む): 171017280

約数和(自身を除く): 89885300

約数列:

[1, 2, 4, 5, 10, 20, 271, 542, 1084, 1355, 2710, 5420, 14969, 29938, 59876, 74845, 149690, 299380, 4056599, 8113198, 16226396, 20282995, 40565990, 81131980]

約数ペア:

[(1, 81131980), (2, 40565990), (4, 20282995), (5, 16226396), (10, 8113198), (20, 4056599), (271, 299380), (542, 149690), (1084, 74845), (1355, 59876), (2710, 29938), (5420, 14969)]