21380571

素因数分解:

$3^3\times {\mathrm{53}}^1\times {\mathrm{67}}^1\times {\mathrm{223}}^1$

素因数の和:352

約数の個数: 32

約数和(自身を含む): 32901120

約数和(自身を除く): 11520549

約数列:

[1, 3, 9, 27, 53, 67, 159, 201, 223, 477, 603, 669, 1431, 1809, 2007, 3551, 6021, 10653, 11819, 14941, 31959, 35457, 44823, 95877, 106371, 134469, 319113, 403407, 791873, 2375619, 7126857, 21380571]

約数ペア:

[(1, 21380571), (3, 7126857), (9, 2375619), (27, 791873), (53, 403407), (67, 319113), (159, 134469), (201, 106371), (223, 95877), (477, 44823), (603, 35457), (669, 31959), (1431, 14941), (1809, 11819), (2007, 10653), (3551, 6021)]