20978109

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{317}}^1$

素因数の和:391

約数の個数: 40

約数和(自身を含む): 33860640

約数和(自身を除く): 12882531

約数列:

[1, 3, 9, 19, 27, 43, 57, 81, 129, 171, 317, 387, 513, 817, 951, 1161, 1539, 2451, 2853, 3483, 6023, 7353, 8559, 13631, 18069, 22059, 25677, 40893, 54207, 66177, 122679, 162621, 258989, 368037, 487863, 776967, 1104111, 2330901, 6992703, 20978109]

約数ペア:

[(1, 20978109), (3, 6992703), (9, 2330901), (19, 1104111), (27, 776967), (43, 487863), (57, 368037), (81, 258989), (129, 162621), (171, 122679), (317, 66177), (387, 54207), (513, 40893), (817, 25677), (951, 22059), (1161, 18069), (1539, 13631), (2451, 8559), (2853, 7353), (3483, 6023)]