400000020

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{952381}}^1$

素因数の和:952400

約数の個数: 48

約数和(自身を含む): 1280001408

約数和(自身を除く): 880001388

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 952381, 1904762, 2857143, 3809524, 4761905, 5714286, 6666667, 9523810, 11428572, 13333334, 14285715, 19047620, 20000001, 26666668, 28571430, 33333335, 40000002, 57142860, 66666670, 80000004, 100000005, 133333340, 200000010, 400000020]

約数ペア:

[(1, 400000020), (2, 200000010), (3, 133333340), (4, 100000005), (5, 80000004), (6, 66666670), (7, 57142860), (10, 40000002), (12, 33333335), (14, 28571430), (15, 26666668), (20, 20000001), (21, 19047620), (28, 14285715), (30, 13333334), (35, 11428572), (42, 9523810), (60, 6666667), (70, 5714286), (84, 4761905), (105, 3809524), (140, 2857143), (210, 1904762), (420, 952381)]