257840

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{293}}^1$

素因数の和:317

約数の個数: 40

約数和(自身を含む): 656208

約数和(自身を除く): 398368

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 110, 176, 220, 293, 440, 586, 880, 1172, 1465, 2344, 2930, 3223, 4688, 5860, 6446, 11720, 12892, 16115, 23440, 25784, 32230, 51568, 64460, 128920, 257840]

約数ペア:

[(1, 257840), (2, 128920), (4, 64460), (5, 51568), (8, 32230), (10, 25784), (11, 23440), (16, 16115), (20, 12892), (22, 11720), (40, 6446), (44, 5860), (55, 4688), (80, 3223), (88, 2930), (110, 2344), (176, 1465), (220, 1172), (293, 880), (440, 586)]