19781215

素因数分解:

$5^1\times {\mathrm{113}}^1\times {\mathrm{157}}^1\times {\mathrm{223}}^1$

素因数の和:498

約数の個数: 16

約数和(自身を含む): 24208128

約数和(自身を除く): 4426913

約数列:

[1, 5, 113, 157, 223, 565, 785, 1115, 17741, 25199, 35011, 88705, 125995, 175055, 3956243, 19781215]

約数ペア:

[(1, 19781215), (5, 3956243), (113, 175055), (157, 125995), (223, 88705), (565, 35011), (785, 25199), (1115, 17741)]