19997150

素因数分解:

$2^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:257

約数の個数: 48

約数和(自身を含む): 38890368

約数和(自身を除く): 18893218

約数列:

[1, 2, 5, 10, 25, 43, 50, 71, 86, 131, 142, 215, 262, 355, 430, 655, 710, 1075, 1310, 1775, 2150, 3053, 3275, 3550, 5633, 6106, 6550, 9301, 11266, 15265, 18602, 28165, 30530, 46505, 56330, 76325, 93010, 140825, 152650, 232525, 281650, 399943, 465050, 799886, 1999715, 3999430, 9998575, 19997150]

約数ペア:

[(1, 19997150), (2, 9998575), (5, 3999430), (10, 1999715), (25, 799886), (43, 465050), (50, 399943), (71, 281650), (86, 232525), (131, 152650), (142, 140825), (215, 93010), (262, 76325), (355, 56330), (430, 46505), (655, 30530), (710, 28165), (1075, 18602), (1310, 15265), (1775, 11266), (2150, 9301), (3053, 6550), (3275, 6106), (3550, 5633)]