21997915

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{257}}^1$

素因数の和:351

約数の個数: 32

約数和(自身を含む): 30093120

約数和(自身を除く): 8095205

約数列:

[1, 5, 17, 19, 53, 85, 95, 257, 265, 323, 901, 1007, 1285, 1615, 4369, 4505, 4883, 5035, 13621, 17119, 21845, 24415, 68105, 83011, 85595, 231557, 258799, 415055, 1157785, 1293995, 4399583, 21997915]

約数ペア:

[(1, 21997915), (5, 4399583), (17, 1293995), (19, 1157785), (53, 415055), (85, 258799), (95, 231557), (257, 85595), (265, 83011), (323, 68105), (901, 24415), (1007, 21845), (1285, 17119), (1615, 13621), (4369, 5035), (4505, 4883)]