19998775

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{109}}^1\times {\mathrm{179}}^1$

素因数の和:339

約数の個数: 24

約数和(自身を含む): 25779600

約数和(自身を除く): 5780825

約数列:

[1, 5, 25, 41, 109, 179, 205, 545, 895, 1025, 2725, 4469, 4475, 7339, 19511, 22345, 36695, 97555, 111725, 183475, 487775, 799951, 3999755, 19998775]

約数ペア:

[(1, 19998775), (5, 3999755), (25, 799951), (41, 487775), (109, 183475), (179, 111725), (205, 97555), (545, 36695), (895, 22345), (1025, 19511), (2725, 7339), (4469, 4475)]