19999525

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{149}}^1$

素因数の和:238

約数の個数: 48

約数和(自身を含む): 31248000

約数和(自身を除く): 11248475

約数列:

[1, 5, 7, 13, 25, 35, 59, 65, 91, 149, 175, 295, 325, 413, 455, 745, 767, 1043, 1475, 1937, 2065, 2275, 3725, 3835, 5215, 5369, 8791, 9685, 10325, 13559, 19175, 26075, 26845, 43955, 48425, 61537, 67795, 114283, 134225, 219775, 307685, 338975, 571415, 799981, 1538425, 2857075, 3999905, 19999525]

約数ペア:

[(1, 19999525), (5, 3999905), (7, 2857075), (13, 1538425), (25, 799981), (35, 571415), (59, 338975), (65, 307685), (91, 219775), (149, 134225), (175, 114283), (295, 67795), (325, 61537), (413, 48425), (455, 43955), (745, 26845), (767, 26075), (1043, 19175), (1475, 13559), (1937, 10325), (2065, 9685), (2275, 8791), (3725, 5369), (3835, 5215)]