21276428

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{3943}}^1$

素因数の和:4037

約数の個数: 24

約数和(自身を含む): 39755520

約数和(自身を除く): 18479092

約数列:

[1, 2, 4, 19, 38, 71, 76, 142, 284, 1349, 2698, 3943, 5396, 7886, 15772, 74917, 149834, 279953, 299668, 559906, 1119812, 5319107, 10638214, 21276428]

約数ペア:

[(1, 21276428), (2, 10638214), (4, 5319107), (19, 1119812), (38, 559906), (71, 299668), (76, 279953), (142, 149834), (284, 74917), (1349, 15772), (2698, 7886), (3943, 5396)]