20049820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{499}}^1$

素因数の和:563

約数の個数: 72

約数和(自身を含む): 50274000

約数和(自身を除く): 30224180

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 41, 49, 70, 82, 98, 140, 164, 196, 205, 245, 287, 410, 490, 499, 574, 820, 980, 998, 1148, 1435, 1996, 2009, 2495, 2870, 3493, 4018, 4990, 5740, 6986, 8036, 9980, 10045, 13972, 17465, 20090, 20459, 24451, 34930, 40180, 40918, 48902, 69860, 81836, 97804, 102295, 122255, 143213, 204590, 244510, 286426, 409180, 489020, 572852, 716065, 1002491, 1432130, 2004982, 2864260, 4009964, 5012455, 10024910, 20049820]

約数ペア:

[(1, 20049820), (2, 10024910), (4, 5012455), (5, 4009964), (7, 2864260), (10, 2004982), (14, 1432130), (20, 1002491), (28, 716065), (35, 572852), (41, 489020), (49, 409180), (70, 286426), (82, 244510), (98, 204590), (140, 143213), (164, 122255), (196, 102295), (205, 97804), (245, 81836), (287, 69860), (410, 48902), (490, 40918), (499, 40180), (574, 34930), (820, 24451), (980, 20459), (998, 20090), (1148, 17465), (1435, 13972), (1996, 10045), (2009, 9980), (2495, 8036), (2870, 6986), (3493, 5740), (4018, 4990)]