21780715

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{3023}}^1$

素因数の和:3170

約数の個数: 16

約数和(自身を含む): 28740096

約数和(自身を除く): 6959381

約数列:

[1, 5, 11, 55, 131, 655, 1441, 3023, 7205, 15115, 33253, 166265, 396013, 1980065, 4356143, 21780715]

約数ペア:

[(1, 21780715), (5, 4356143), (11, 1980065), (55, 396013), (131, 166265), (655, 33253), (1441, 15115), (3023, 7205)]