81900760

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{257}}^2$

素因数の和:556

約数の個数: 48

約数和(自身を含む): 190964160

約数和(自身を除く): 109063400

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 257, 310, 514, 620, 1028, 1240, 1285, 2056, 2570, 5140, 7967, 10280, 15934, 31868, 39835, 63736, 66049, 79670, 132098, 159340, 264196, 318680, 330245, 528392, 660490, 1320980, 2047519, 2641960, 4095038, 8190076, 10237595, 16380152, 20475190, 40950380, 81900760]

約数ペア:

[(1, 81900760), (2, 40950380), (4, 20475190), (5, 16380152), (8, 10237595), (10, 8190076), (20, 4095038), (31, 2641960), (40, 2047519), (62, 1320980), (124, 660490), (155, 528392), (248, 330245), (257, 318680), (310, 264196), (514, 159340), (620, 132098), (1028, 79670), (1240, 66049), (1285, 63736), (2056, 39835), (2570, 31868), (5140, 15934), (7967, 10280)]