20666815

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{317}}^1$

素因数の和:411

約数の個数: 32

約数和(自身を含む): 28848960

約数和(自身を除く): 8182145

約数列:

[1, 5, 13, 17, 59, 65, 85, 221, 295, 317, 767, 1003, 1105, 1585, 3835, 4121, 5015, 5389, 13039, 18703, 20605, 26945, 65195, 70057, 93515, 243139, 317951, 350285, 1215695, 1589755, 4133363, 20666815]

約数ペア:

[(1, 20666815), (5, 4133363), (13, 1589755), (17, 1215695), (59, 350285), (65, 317951), (85, 243139), (221, 93515), (295, 70057), (317, 65195), (767, 26945), (1003, 20605), (1105, 18703), (1585, 13039), (3835, 5389), (4121, 5015)]