21216545

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{20903}}^1$

素因数の和:20944

約数の個数: 16

約数和(自身を含む): 30101760

約数和(自身を除く): 8885215

約数列:

[1, 5, 7, 29, 35, 145, 203, 1015, 20903, 104515, 146321, 606187, 731605, 3030935, 4243309, 21216545]

約数ペア:

[(1, 21216545), (5, 4243309), (7, 3030935), (29, 731605), (35, 606187), (145, 146321), (203, 104515), (1015, 20903)]