21855665

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{59}}^1\times {\mathrm{139}}^1$

素因数の和:257

約数の個数: 32

約数和(自身を含む): 29635200

約数和(自身を除く): 7779535

約数列:

[1, 5, 13, 41, 59, 65, 139, 205, 295, 533, 695, 767, 1807, 2419, 2665, 3835, 5699, 8201, 9035, 12095, 28495, 31447, 41005, 74087, 106613, 157235, 336241, 370435, 533065, 1681205, 4371133, 21855665]

約数ペア:

[(1, 21855665), (5, 4371133), (13, 1681205), (41, 533065), (59, 370435), (65, 336241), (139, 157235), (205, 106613), (295, 74087), (533, 41005), (695, 31447), (767, 28495), (1807, 12095), (2419, 9035), (2665, 8201), (3835, 5699)]