21047740

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{1009}}^1$

素因数の和:1174

約数の個数: 48

約数和(自身を含む): 50904000

約数和(自身を除く): 29856260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 149, 298, 596, 745, 1009, 1043, 1490, 2018, 2086, 2980, 4036, 4172, 5045, 5215, 7063, 10090, 10430, 14126, 20180, 20860, 28252, 35315, 70630, 141260, 150341, 300682, 601364, 751705, 1052387, 1503410, 2104774, 3006820, 4209548, 5261935, 10523870, 21047740]

約数ペア:

[(1, 21047740), (2, 10523870), (4, 5261935), (5, 4209548), (7, 3006820), (10, 2104774), (14, 1503410), (20, 1052387), (28, 751705), (35, 601364), (70, 300682), (140, 150341), (149, 141260), (298, 70630), (596, 35315), (745, 28252), (1009, 20860), (1043, 20180), (1490, 14126), (2018, 10430), (2086, 10090), (2980, 7063), (4036, 5215), (4172, 5045)]