19987984

素因数分解:

$2^4\times {\mathrm{73}}^1\times {\mathrm{109}}^1\times {\mathrm{157}}^1$

素因数の和:347

約数の個数: 40

約数和(自身を含む): 39869720

約数和(自身を除く): 19881736

約数列:

[1, 2, 4, 8, 16, 73, 109, 146, 157, 218, 292, 314, 436, 584, 628, 872, 1168, 1256, 1744, 2512, 7957, 11461, 15914, 17113, 22922, 31828, 34226, 45844, 63656, 68452, 91688, 127312, 136904, 183376, 273808, 1249249, 2498498, 4996996, 9993992, 19987984]

約数ペア:

[(1, 19987984), (2, 9993992), (4, 4996996), (8, 2498498), (16, 1249249), (73, 273808), (109, 183376), (146, 136904), (157, 127312), (218, 91688), (292, 68452), (314, 63656), (436, 45844), (584, 34226), (628, 31828), (872, 22922), (1168, 17113), (1256, 15914), (1744, 11461), (2512, 7957)]