21686540

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{499}}^1$

素因数の和:602

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 25941460

約数列:

[1, 2, 4, 5, 10, 20, 41, 53, 82, 106, 164, 205, 212, 265, 410, 499, 530, 820, 998, 1060, 1996, 2173, 2495, 4346, 4990, 8692, 9980, 10865, 20459, 21730, 26447, 40918, 43460, 52894, 81836, 102295, 105788, 132235, 204590, 264470, 409180, 528940, 1084327, 2168654, 4337308, 5421635, 10843270, 21686540]

約数ペア:

[(1, 21686540), (2, 10843270), (4, 5421635), (5, 4337308), (10, 2168654), (20, 1084327), (41, 528940), (53, 409180), (82, 264470), (106, 204590), (164, 132235), (205, 105788), (212, 102295), (265, 81836), (410, 52894), (499, 43460), (530, 40918), (820, 26447), (998, 21730), (1060, 20459), (1996, 10865), (2173, 9980), (2495, 8692), (4346, 4990)]