278399980

素因数分解:

$2^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{21059}}^1$

素因数の和:21729

約数の個数: 24

約数和(自身を含む): 585552240

約数和(自身を除く): 307152260

約数列:

[1, 2, 4, 5, 10, 20, 661, 1322, 2644, 3305, 6610, 13220, 21059, 42118, 84236, 105295, 210590, 421180, 13919999, 27839998, 55679996, 69599995, 139199990, 278399980]

約数ペア:

[(1, 278399980), (2, 139199990), (4, 69599995), (5, 55679996), (10, 27839998), (20, 13919999), (661, 421180), (1322, 210590), (2644, 105295), (3305, 84236), (6610, 42118), (13220, 21059)]