21561813

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{3761}}^1$

素因数の和:3794

約数の個数: 36

約数和(自身を含む): 39026988

約数和(自身を除く): 17465175

約数列:

[1, 3, 7, 9, 13, 21, 39, 49, 63, 91, 117, 147, 273, 441, 637, 819, 1911, 3761, 5733, 11283, 26327, 33849, 48893, 78981, 146679, 184289, 236943, 342251, 440037, 552867, 1026753, 1658601, 2395757, 3080259, 7187271, 21561813]

約数ペア:

[(1, 21561813), (3, 7187271), (7, 3080259), (9, 2395757), (13, 1658601), (21, 1026753), (39, 552867), (49, 440037), (63, 342251), (91, 236943), (117, 184289), (147, 146679), (273, 78981), (441, 48893), (637, 33849), (819, 26327), (1911, 11283), (3761, 5733)]