21991795

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{1607}}^1$

素因数の和:1659

約数の個数: 32

約数和(自身を含む): 33343488

約数和(自身を除く): 11351693

約数列:

[1, 5, 7, 17, 23, 35, 85, 115, 119, 161, 391, 595, 805, 1607, 1955, 2737, 8035, 11249, 13685, 27319, 36961, 56245, 136595, 184805, 191233, 258727, 628337, 956165, 1293635, 3141685, 4398359, 21991795]

約数ペア:

[(1, 21991795), (5, 4398359), (7, 3141685), (17, 1293635), (23, 956165), (35, 628337), (85, 258727), (115, 191233), (119, 184805), (161, 136595), (391, 56245), (595, 36961), (805, 27319), (1607, 13685), (1955, 11249), (2737, 8035)]