21292120

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12983}}^1$

素因数の和:13035

約数の個数: 32

約数和(自身を含む): 49079520

約数和(自身を除く): 27787400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12983, 25966, 51932, 64915, 103864, 129830, 259660, 519320, 532303, 1064606, 2129212, 2661515, 4258424, 5323030, 10646060, 21292120]

約数ペア:

[(1, 21292120), (2, 10646060), (4, 5323030), (5, 4258424), (8, 2661515), (10, 2129212), (20, 1064606), (40, 532303), (41, 519320), (82, 259660), (164, 129830), (205, 103864), (328, 64915), (410, 51932), (820, 25966), (1640, 12983)]