20499975

素因数分解:

$3^2\times 5^2\times {\mathrm{179}}^1\times {\mathrm{509}}^1$

素因数の和:704

約数の個数: 36

約数和(自身を含む): 36995400

約数和(自身を除く): 16495425

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 179, 225, 509, 537, 895, 1527, 1611, 2545, 2685, 4475, 4581, 7635, 8055, 12725, 13425, 22905, 38175, 40275, 91111, 114525, 273333, 455555, 819999, 1366665, 2277775, 4099995, 6833325, 20499975]

約数ペア:

[(1, 20499975), (3, 6833325), (5, 4099995), (9, 2277775), (15, 1366665), (25, 819999), (45, 455555), (75, 273333), (179, 114525), (225, 91111), (509, 40275), (537, 38175), (895, 22905), (1527, 13425), (1611, 12725), (2545, 8055), (2685, 7635), (4475, 4581)]