20654608

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{499}}^1$

素因数の和:719

約数の個数: 40

約数和(自身を含む): 43400000

約数和(自身を除く): 22745392

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 199, 208, 398, 499, 796, 998, 1592, 1996, 2587, 3184, 3992, 5174, 6487, 7984, 10348, 12974, 20696, 25948, 41392, 51896, 99301, 103792, 198602, 397204, 794408, 1290913, 1588816, 2581826, 5163652, 10327304, 20654608]

約数ペア:

[(1, 20654608), (2, 10327304), (4, 5163652), (8, 2581826), (13, 1588816), (16, 1290913), (26, 794408), (52, 397204), (104, 198602), (199, 103792), (208, 99301), (398, 51896), (499, 41392), (796, 25948), (998, 20696), (1592, 12974), (1996, 10348), (2587, 7984), (3184, 6487), (3992, 5174)]