19988920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71389}}^1$

素因数の和:71407

約数の個数: 32

約数和(自身を含む): 51400800

約数和(自身を除く): 31411880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 71389, 142778, 285556, 356945, 499723, 571112, 713890, 999446, 1427780, 1998892, 2498615, 2855560, 3997784, 4997230, 9994460, 19988920]

約数ペア:

[(1, 19988920), (2, 9994460), (4, 4997230), (5, 3997784), (7, 2855560), (8, 2498615), (10, 1998892), (14, 1427780), (20, 999446), (28, 713890), (35, 571112), (40, 499723), (56, 356945), (70, 285556), (140, 142778), (280, 71389)]