21965713

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{157}}^1$

素因数の和:277

約数の個数: 32

約数和(自身を含む): 29122560

約数和(自身を除く): 7156847

約数列:

[1, 7, 11, 23, 77, 79, 157, 161, 253, 553, 869, 1099, 1727, 1771, 1817, 3611, 6083, 12089, 12403, 12719, 19987, 25277, 39721, 86821, 136433, 139909, 278047, 285269, 955031, 1996883, 3137959, 21965713]

約数ペア:

[(1, 21965713), (7, 3137959), (11, 1996883), (23, 955031), (77, 285269), (79, 278047), (157, 139909), (161, 136433), (253, 86821), (553, 39721), (869, 25277), (1099, 19987), (1727, 12719), (1771, 12403), (1817, 12089), (3611, 6083)]