18712525

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{103}}^1$

素因数の和:182

約数の個数: 36

約数和(自身を含む): 25959648

約数和(自身を除く): 7247123

約数列:

[1, 5, 13, 25, 43, 65, 103, 169, 215, 325, 515, 559, 845, 1075, 1339, 2575, 2795, 4225, 4429, 6695, 7267, 13975, 17407, 22145, 33475, 36335, 57577, 87035, 110725, 181675, 287885, 435175, 748501, 1439425, 3742505, 18712525]

約数ペア:

[(1, 18712525), (5, 3742505), (13, 1439425), (25, 748501), (43, 435175), (65, 287885), (103, 181675), (169, 110725), (215, 87035), (325, 57577), (515, 36335), (559, 33475), (845, 22145), (1075, 17407), (1339, 13975), (2575, 7267), (2795, 6695), (4225, 4429)]