21706120

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7643}}^1$

素因数の和:7725

約数の個数: 32

約数和(自身を含む): 49533120

約数和(自身を除く): 27827000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7643, 15286, 30572, 38215, 61144, 76430, 152860, 305720, 542653, 1085306, 2170612, 2713265, 4341224, 5426530, 10853060, 21706120]

約数ペア:

[(1, 21706120), (2, 10853060), (4, 5426530), (5, 4341224), (8, 2713265), (10, 2170612), (20, 1085306), (40, 542653), (71, 305720), (142, 152860), (284, 76430), (355, 61144), (568, 38215), (710, 30572), (1420, 15286), (2840, 7643)]