20217519

素因数分解:

$3^4\times 7^1\times {\mathrm{181}}^1\times {\mathrm{197}}^1$

素因数の和:397

約数の個数: 40

約数和(自身を含む): 34882848

約数和(自身を除く): 14665329

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 181, 189, 197, 543, 567, 591, 1267, 1379, 1629, 1773, 3801, 4137, 4887, 5319, 11403, 12411, 14661, 15957, 34209, 35657, 37233, 102627, 106971, 111699, 249599, 320913, 748797, 962739, 2246391, 2888217, 6739173, 20217519]

約数ペア:

[(1, 20217519), (3, 6739173), (7, 2888217), (9, 2246391), (21, 962739), (27, 748797), (63, 320913), (81, 249599), (181, 111699), (189, 106971), (197, 102627), (543, 37233), (567, 35657), (591, 34209), (1267, 15957), (1379, 14661), (1629, 12411), (1773, 11403), (3801, 5319), (4137, 4887)]