21129729

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:245

約数の個数: 32

約数和(自身を含む): 30950400

約数和(自身を除く): 9820671

約数列:

[1, 3, 19, 57, 59, 61, 103, 177, 183, 309, 1121, 1159, 1957, 3363, 3477, 3599, 5871, 6077, 6283, 10797, 18231, 18849, 68381, 115463, 119377, 205143, 346389, 358131, 370697, 1112091, 7043243, 21129729]

約数ペア:

[(1, 21129729), (3, 7043243), (19, 1112091), (57, 370697), (59, 358131), (61, 346389), (103, 205143), (177, 119377), (183, 115463), (309, 68381), (1121, 18849), (1159, 18231), (1957, 10797), (3363, 6283), (3477, 6077), (3599, 5871)]