21157388

素因数分解:

$2^2\times 7^1\times {\mathrm{53}}^2\times {\mathrm{269}}^1$

素因数の和:386

約数の個数: 36

約数和(自身を含む): 43288560

約数和(自身を除く): 22131172

約数列:

[1, 2, 4, 7, 14, 28, 53, 106, 212, 269, 371, 538, 742, 1076, 1484, 1883, 2809, 3766, 5618, 7532, 11236, 14257, 19663, 28514, 39326, 57028, 78652, 99799, 199598, 399196, 755621, 1511242, 3022484, 5289347, 10578694, 21157388]

約数ペア:

[(1, 21157388), (2, 10578694), (4, 5289347), (7, 3022484), (14, 1511242), (28, 755621), (53, 399196), (106, 199598), (212, 99799), (269, 78652), (371, 57028), (538, 39326), (742, 28514), (1076, 19663), (1484, 14257), (1883, 11236), (2809, 7532), (3766, 5618)]