19980891

素因数分解:

$3^3\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1489}}^1$

素因数の和:1576

約数の個数: 32

約数和(自身を含む): 34329600

約数和(自身を除く): 14348709

約数列:

[1, 3, 7, 9, 21, 27, 63, 71, 189, 213, 497, 639, 1489, 1491, 1917, 4467, 4473, 10423, 13401, 13419, 31269, 40203, 93807, 105719, 281421, 317157, 740033, 951471, 2220099, 2854413, 6660297, 19980891]

約数ペア:

[(1, 19980891), (3, 6660297), (7, 2854413), (9, 2220099), (21, 951471), (27, 740033), (63, 317157), (71, 281421), (189, 105719), (213, 93807), (497, 40203), (639, 31269), (1489, 13419), (1491, 13401), (1917, 10423), (4467, 4473)]