399978

素因数分解:

$2^1\times 3^5\times {\mathrm{823}}^1$

素因数の和:840

約数の個数: 24

約数和(自身を含む): 899808

約数和(自身を除く): 499830

約数列:

[1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 243, 486, 823, 1646, 2469, 4938, 7407, 14814, 22221, 44442, 66663, 133326, 199989, 399978]

約数ペア:

[(1, 399978), (2, 199989), (3, 133326), (6, 66663), (9, 44442), (18, 22221), (27, 14814), (54, 7407), (81, 4938), (162, 2469), (243, 1646), (486, 823)]