21720580

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{3301}}^1$

素因数の和:3364

約数の個数: 48

約数和(自身を含む): 53254656

約数和(自身を除く): 31534076

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 70, 94, 140, 188, 235, 329, 470, 658, 940, 1316, 1645, 3290, 3301, 6580, 6602, 13204, 16505, 23107, 33010, 46214, 66020, 92428, 115535, 155147, 231070, 310294, 462140, 620588, 775735, 1086029, 1551470, 2172058, 3102940, 4344116, 5430145, 10860290, 21720580]

約数ペア:

[(1, 21720580), (2, 10860290), (4, 5430145), (5, 4344116), (7, 3102940), (10, 2172058), (14, 1551470), (20, 1086029), (28, 775735), (35, 620588), (47, 462140), (70, 310294), (94, 231070), (140, 155147), (188, 115535), (235, 92428), (329, 66020), (470, 46214), (658, 33010), (940, 23107), (1316, 16505), (1645, 13204), (3290, 6602), (3301, 6580)]