20801965

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{127}}^1$

素因数の和:237

約数の個数: 32

約数和(自身を含む): 27869184

約数和(自身を除く): 7067219

約数列:

[1, 5, 17, 41, 47, 85, 127, 205, 235, 635, 697, 799, 1927, 2159, 3485, 3995, 5207, 5969, 9635, 10795, 26035, 29845, 32759, 88519, 101473, 163795, 244729, 442595, 507365, 1223645, 4160393, 20801965]

約数ペア:

[(1, 20801965), (5, 4160393), (17, 1223645), (41, 507365), (47, 442595), (85, 244729), (127, 163795), (205, 101473), (235, 88519), (635, 32759), (697, 29845), (799, 26035), (1927, 10795), (2159, 9635), (3485, 5969), (3995, 5207)]