19782500

素因数分解:

$2^2\times 5^4\times {\mathrm{41}}^1\times {\mathrm{193}}^1$

素因数の和:258

約数の個数: 60

約数和(自身を含む): 44545116

約数和(自身を除く): 24762616

約数列:

[1, 2, 4, 5, 10, 20, 25, 41, 50, 82, 100, 125, 164, 193, 205, 250, 386, 410, 500, 625, 772, 820, 965, 1025, 1250, 1930, 2050, 2500, 3860, 4100, 4825, 5125, 7913, 9650, 10250, 15826, 19300, 20500, 24125, 25625, 31652, 39565, 48250, 51250, 79130, 96500, 102500, 120625, 158260, 197825, 241250, 395650, 482500, 791300, 989125, 1978250, 3956500, 4945625, 9891250, 19782500]

約数ペア:

[(1, 19782500), (2, 9891250), (4, 4945625), (5, 3956500), (10, 1978250), (20, 989125), (25, 791300), (41, 482500), (50, 395650), (82, 241250), (100, 197825), (125, 158260), (164, 120625), (193, 102500), (205, 96500), (250, 79130), (386, 51250), (410, 48250), (500, 39565), (625, 31652), (772, 25625), (820, 24125), (965, 20500), (1025, 19300), (1250, 15826), (1930, 10250), (2050, 9650), (2500, 7913), (3860, 5125), (4100, 4825)]