21360220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{271}}^1\times {\mathrm{563}}^1$

素因数の和:850

約数の個数: 48

約数和(自身を含む): 51545088

約数和(自身を除く): 30184868

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 271, 542, 563, 1084, 1126, 1355, 1897, 2252, 2710, 2815, 3794, 3941, 5420, 5630, 7588, 7882, 9485, 11260, 15764, 18970, 19705, 37940, 39410, 78820, 152573, 305146, 610292, 762865, 1068011, 1525730, 2136022, 3051460, 4272044, 5340055, 10680110, 21360220]

約数ペア:

[(1, 21360220), (2, 10680110), (4, 5340055), (5, 4272044), (7, 3051460), (10, 2136022), (14, 1525730), (20, 1068011), (28, 762865), (35, 610292), (70, 305146), (140, 152573), (271, 78820), (542, 39410), (563, 37940), (1084, 19705), (1126, 18970), (1355, 15764), (1897, 11260), (2252, 9485), (2710, 7882), (2815, 7588), (3794, 5630), (3941, 5420)]