21291305

素因数分解:

$5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{317}}^1$

素因数の和:449

約数の個数: 32

約数和(自身を含む): 31138560

約数和(自身を除く): 9847255

約数列:

[1, 5, 7, 19, 35, 95, 101, 133, 317, 505, 665, 707, 1585, 1919, 2219, 3535, 6023, 9595, 11095, 13433, 30115, 32017, 42161, 67165, 160085, 210805, 224119, 608323, 1120595, 3041615, 4258261, 21291305]

約数ペア:

[(1, 21291305), (5, 4258261), (7, 3041615), (19, 1120595), (35, 608323), (95, 224119), (101, 210805), (133, 160085), (317, 67165), (505, 42161), (665, 32017), (707, 30115), (1585, 13433), (1919, 11095), (2219, 9595), (3535, 6023)]