21255980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14969}}^1$

素因数の和:15049

約数の個数: 24

約数和(自身を含む): 45269280

約数和(自身を除く): 24013300

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14969, 29938, 59876, 74845, 149690, 299380, 1062799, 2125598, 4251196, 5313995, 10627990, 21255980]

約数ペア:

[(1, 21255980), (2, 10627990), (4, 5313995), (5, 4251196), (10, 2125598), (20, 1062799), (71, 299380), (142, 149690), (284, 74845), (355, 59876), (710, 29938), (1420, 14969)]