21981575

素因数分解:

$5^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{601}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 35831040

約数和(自身を除く): 13849465

約数列:

[1, 5, 7, 11, 19, 25, 35, 55, 77, 95, 133, 175, 209, 275, 385, 475, 601, 665, 1045, 1463, 1925, 3005, 3325, 4207, 5225, 6611, 7315, 11419, 15025, 21035, 33055, 36575, 46277, 57095, 79933, 105175, 125609, 165275, 231385, 285475, 399665, 628045, 879263, 1156925, 1998325, 3140225, 4396315, 21981575]

約数ペア:

[(1, 21981575), (5, 4396315), (7, 3140225), (11, 1998325), (19, 1156925), (25, 879263), (35, 628045), (55, 399665), (77, 285475), (95, 231385), (133, 165275), (175, 125609), (209, 105175), (275, 79933), (385, 57095), (475, 46277), (601, 36575), (665, 33055), (1045, 21035), (1463, 15025), (1925, 11419), (3005, 7315), (3325, 6611), (4207, 5225)]