318980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{389}}^1$

素因数の和:439

約数の個数: 24

約数和(自身を含む): 687960

約数和(自身を除く): 368980

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 389, 410, 778, 820, 1556, 1945, 3890, 7780, 15949, 31898, 63796, 79745, 159490, 318980]

約数ペア:

[(1, 318980), (2, 159490), (4, 79745), (5, 63796), (10, 31898), (20, 15949), (41, 7780), (82, 3890), (164, 1945), (205, 1556), (389, 820), (410, 778)]