21681989

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{2437}}^1$

素因数の和:2516

約数の個数: 16

約数和(自身を含む): 26213376

約数和(自身を除く): 4531387

約数列:

[1, 7, 31, 41, 217, 287, 1271, 2437, 8897, 17059, 75547, 99917, 528829, 699419, 3097427, 21681989]

約数ペア:

[(1, 21681989), (7, 3097427), (31, 699419), (41, 528829), (217, 99917), (287, 75547), (1271, 17059), (2437, 8897)]