19845

素因数分解:

$3^4\times 5^1\times 7^2$

素因数の和:31

約数の個数: 30

約数和(自身を含む): 41382

約数和(自身を除く): 21537

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 49, 63, 81, 105, 135, 147, 189, 245, 315, 405, 441, 567, 735, 945, 1323, 2205, 2835, 3969, 6615, 19845]

約数ペア:

[(1, 19845), (3, 6615), (5, 3969), (7, 2835), (9, 2205), (15, 1323), (21, 945), (27, 735), (35, 567), (45, 441), (49, 405), (63, 315), (81, 245), (105, 189), (135, 147)]