21289975

素因数分解:

$5^2\times 7^1\times {\mathrm{19}}^2\times {\mathrm{337}}^1$

素因数の和:392

約数の個数: 36

約数和(自身を含む): 31936944

約数和(自身を除く): 10646969

約数列:

[1, 5, 7, 19, 25, 35, 95, 133, 175, 337, 361, 475, 665, 1685, 1805, 2359, 2527, 3325, 6403, 8425, 9025, 11795, 12635, 32015, 44821, 58975, 63175, 121657, 160075, 224105, 608285, 851599, 1120525, 3041425, 4257995, 21289975]

約数ペア:

[(1, 21289975), (5, 4257995), (7, 3041425), (19, 1120525), (25, 851599), (35, 608285), (95, 224105), (133, 160075), (175, 121657), (337, 63175), (361, 58975), (475, 44821), (665, 32015), (1685, 12635), (1805, 11795), (2359, 9025), (2527, 8425), (3325, 6403)]