19989711

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{157}}^1$

素因数の和:260

約数の個数: 48

約数和(自身を含む): 34704384

約数和(自身を除く): 14714673

約数列:

[1, 3, 7, 9, 21, 43, 47, 63, 129, 141, 157, 301, 329, 387, 423, 471, 903, 987, 1099, 1413, 2021, 2709, 2961, 3297, 6063, 6751, 7379, 9891, 14147, 18189, 20253, 22137, 42441, 47257, 51653, 60759, 66411, 127323, 141771, 154959, 317297, 425313, 464877, 951891, 2221079, 2855673, 6663237, 19989711]

約数ペア:

[(1, 19989711), (3, 6663237), (7, 2855673), (9, 2221079), (21, 951891), (43, 464877), (47, 425313), (63, 317297), (129, 154959), (141, 141771), (157, 127323), (301, 66411), (329, 60759), (387, 51653), (423, 47257), (471, 42441), (903, 22137), (987, 20253), (1099, 18189), (1413, 14147), (2021, 9891), (2709, 7379), (2961, 6751), (3297, 6063)]