21218295

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{11887}}^1$

素因数の和:11919

約数の個数: 32

約数和(自身を含む): 41084928

約数和(自身を除く): 19866633

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 51, 85, 105, 119, 255, 357, 595, 1785, 11887, 35661, 59435, 83209, 178305, 202079, 249627, 416045, 606237, 1010395, 1248135, 1414553, 3031185, 4243659, 7072765, 21218295]

約数ペア:

[(1, 21218295), (3, 7072765), (5, 4243659), (7, 3031185), (15, 1414553), (17, 1248135), (21, 1010395), (35, 606237), (51, 416045), (85, 249627), (105, 202079), (119, 178305), (255, 83209), (357, 59435), (595, 35661), (1785, 11887)]