21587120

素因数分解:

$2^4\times 5^1\times {\mathrm{149}}^1\times {\mathrm{1811}}^1$

素因数の和:1973

約数の個数: 40

約数和(自身を含む): 50554800

約数和(自身を除く): 28967680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 149, 298, 596, 745, 1192, 1490, 1811, 2384, 2980, 3622, 5960, 7244, 9055, 11920, 14488, 18110, 28976, 36220, 72440, 144880, 269839, 539678, 1079356, 1349195, 2158712, 2698390, 4317424, 5396780, 10793560, 21587120]

約数ペア:

[(1, 21587120), (2, 10793560), (4, 5396780), (5, 4317424), (8, 2698390), (10, 2158712), (16, 1349195), (20, 1079356), (40, 539678), (80, 269839), (149, 144880), (298, 72440), (596, 36220), (745, 28976), (1192, 18110), (1490, 14488), (1811, 11920), (2384, 9055), (2980, 7244), (3622, 5960)]