21132819

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{149}}^1$

素因数の和:281

約数の個数: 40

約数和(自身を含む): 33976800

約数和(自身を除く): 12843981

約数列:

[1, 3, 9, 17, 27, 51, 81, 103, 149, 153, 309, 447, 459, 927, 1341, 1377, 1751, 2533, 2781, 4023, 5253, 7599, 8343, 12069, 15347, 15759, 22797, 46041, 47277, 68391, 138123, 141831, 205173, 260899, 414369, 782697, 1243107, 2348091, 7044273, 21132819]

約数ペア:

[(1, 21132819), (3, 7044273), (9, 2348091), (17, 1243107), (27, 782697), (51, 414369), (81, 260899), (103, 205173), (149, 141831), (153, 138123), (309, 68391), (447, 47277), (459, 46041), (927, 22797), (1341, 15759), (1377, 15347), (1751, 12069), (2533, 8343), (2781, 7599), (4023, 5253)]