21387345

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{347}}^1\times {\mathrm{587}}^1$

素因数の和:949

約数の個数: 32

約数和(自身を含む): 39287808

約数和(自身を除く): 17900463

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 347, 587, 1041, 1735, 1761, 2429, 2935, 4109, 5205, 7287, 8805, 12145, 12327, 20545, 36435, 61635, 203689, 611067, 1018445, 1425823, 3055335, 4277469, 7129115, 21387345]

約数ペア:

[(1, 21387345), (3, 7129115), (5, 4277469), (7, 3055335), (15, 1425823), (21, 1018445), (35, 611067), (105, 203689), (347, 61635), (587, 36435), (1041, 20545), (1735, 12327), (1761, 12145), (2429, 8805), (2935, 7287), (4109, 5205)]