21028203

素因数分解:

$3^2\times 7^2\times {\mathrm{41}}^1\times {\mathrm{1163}}^1$

素因数の和:1224

約数の個数: 36

約数和(自身を含む): 36226008

約数和(自身を除く): 15197805

約数列:

[1, 3, 7, 9, 21, 41, 49, 63, 123, 147, 287, 369, 441, 861, 1163, 2009, 2583, 3489, 6027, 8141, 10467, 18081, 24423, 47683, 56987, 73269, 143049, 170961, 333781, 429147, 512883, 1001343, 2336467, 3004029, 7009401, 21028203]

約数ペア:

[(1, 21028203), (3, 7009401), (7, 3004029), (9, 2336467), (21, 1001343), (41, 512883), (49, 429147), (63, 333781), (123, 170961), (147, 143049), (287, 73269), (369, 56987), (441, 47683), (861, 24423), (1163, 18081), (2009, 10467), (2583, 8141), (3489, 6027)]