21081545

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{53}}^2\times {\mathrm{79}}^1$

素因数の和:209

約数の個数: 24

約数和(自身を含む): 27484800

約数和(自身を除く): 6403255

約数列:

[1, 5, 19, 53, 79, 95, 265, 395, 1007, 1501, 2809, 4187, 5035, 7505, 14045, 20935, 53371, 79553, 221911, 266855, 397765, 1109555, 4216309, 21081545]

約数ペア:

[(1, 21081545), (5, 4216309), (19, 1109555), (53, 397765), (79, 266855), (95, 221911), (265, 79553), (395, 53371), (1007, 20935), (1501, 14045), (2809, 7505), (4187, 5035)]