21155540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1103}}^1$

素因数の和:1256

約数の個数: 48

約数和(自身を含む): 51190272

約数和(自身を除く): 30034732

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 137, 140, 274, 548, 685, 959, 1103, 1370, 1918, 2206, 2740, 3836, 4412, 4795, 5515, 7721, 9590, 11030, 15442, 19180, 22060, 30884, 38605, 77210, 151111, 154420, 302222, 604444, 755555, 1057777, 1511110, 2115554, 3022220, 4231108, 5288885, 10577770, 21155540]

約数ペア:

[(1, 21155540), (2, 10577770), (4, 5288885), (5, 4231108), (7, 3022220), (10, 2115554), (14, 1511110), (20, 1057777), (28, 755555), (35, 604444), (70, 302222), (137, 154420), (140, 151111), (274, 77210), (548, 38605), (685, 30884), (959, 22060), (1103, 19180), (1370, 15442), (1918, 11030), (2206, 9590), (2740, 7721), (3836, 5515), (4412, 4795)]