21000496979

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{1787}}^1\times {\mathrm{21803}}^1$

素因数の和:23615

約数の個数: 24

約数和(自身を含む): 26666117568

約数和(自身を除く): 5665620589

約数列:

[1, 7, 11, 49, 77, 539, 1787, 12509, 19657, 21803, 87563, 137599, 152621, 239833, 963193, 1068347, 1678831, 11751817, 38961961, 272733727, 428581571, 1909136089, 3000070997, 21000496979]

約数ペア:

[(1, 21000496979), (7, 3000070997), (11, 1909136089), (49, 428581571), (77, 272733727), (539, 38961961), (1787, 11751817), (12509, 1678831), (19657, 1068347), (21803, 963193), (87563, 239833), (137599, 152621)]