21720125

素因数分解:

$5^3\times 7^1\times {\mathrm{103}}^1\times {\mathrm{241}}^1$

素因数の和:366

約数の個数: 32

約数和(自身を含む): 31409664

約数和(自身を除く): 9689539

約数列:

[1, 5, 7, 25, 35, 103, 125, 175, 241, 515, 721, 875, 1205, 1687, 2575, 3605, 6025, 8435, 12875, 18025, 24823, 30125, 42175, 90125, 124115, 173761, 210875, 620575, 868805, 3102875, 4344025, 21720125]

約数ペア:

[(1, 21720125), (5, 4344025), (7, 3102875), (25, 868805), (35, 620575), (103, 210875), (125, 173761), (175, 124115), (241, 90125), (515, 42175), (721, 30125), (875, 24823), (1205, 18025), (1687, 12875), (2575, 8435), (3605, 6025)]