21520941

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{313}}^1$

素因数の和:413

約数の個数: 32

約数和(自身を含む): 32495232

約数和(自身を除く): 10974291

約数列:

[1, 3, 13, 39, 41, 43, 123, 129, 313, 533, 559, 939, 1599, 1677, 1763, 4069, 5289, 12207, 12833, 13459, 22919, 38499, 40377, 68757, 166829, 174967, 500487, 524901, 551819, 1655457, 7173647, 21520941]

約数ペア:

[(1, 21520941), (3, 7173647), (13, 1655457), (39, 551819), (41, 524901), (43, 500487), (123, 174967), (129, 166829), (313, 68757), (533, 40377), (559, 38499), (939, 22919), (1599, 13459), (1677, 12833), (1763, 12207), (4069, 5289)]