19991720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71399}}^1$

素因数の和:71417

約数の個数: 32

約数和(自身を含む): 51408000

約数和(自身を除く): 31416280

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 71399, 142798, 285596, 356995, 499793, 571192, 713990, 999586, 1427980, 1999172, 2498965, 2855960, 3998344, 4997930, 9995860, 19991720]

約数ペア:

[(1, 19991720), (2, 9995860), (4, 4997930), (5, 3998344), (7, 2855960), (8, 2498965), (10, 1999172), (14, 1427980), (20, 999586), (28, 713990), (35, 571192), (40, 499793), (56, 356995), (70, 285596), (140, 142798), (280, 71399)]