78437960

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^2\times {\mathrm{389}}^1$

素因数の和:542

約数の個数: 48

約数和(自身を含む): 179466300

約数和(自身を除く): 101028340

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 389, 568, 710, 778, 1420, 1556, 1945, 2840, 3112, 3890, 5041, 7780, 10082, 15560, 20164, 25205, 27619, 40328, 50410, 55238, 100820, 110476, 138095, 201640, 220952, 276190, 552380, 1104760, 1960949, 3921898, 7843796, 9804745, 15687592, 19609490, 39218980, 78437960]

約数ペア:

[(1, 78437960), (2, 39218980), (4, 19609490), (5, 15687592), (8, 9804745), (10, 7843796), (20, 3921898), (40, 1960949), (71, 1104760), (142, 552380), (284, 276190), (355, 220952), (389, 201640), (568, 138095), (710, 110476), (778, 100820), (1420, 55238), (1556, 50410), (1945, 40328), (2840, 27619), (3112, 25205), (3890, 20164), (5041, 15560), (7780, 10082)]