21391265

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{26573}}^1$

素因数の和:26608

約数の個数: 16

約数和(自身を含む): 30613248

約数和(自身を除く): 9221983

約数列:

[1, 5, 7, 23, 35, 115, 161, 805, 26573, 132865, 186011, 611179, 930055, 3055895, 4278253, 21391265]

約数ペア:

[(1, 21391265), (5, 4278253), (7, 3055895), (23, 930055), (35, 611179), (115, 186011), (161, 132865), (805, 26573)]