21298221

素因数分解:

$3^5\times 7^1\times {\mathrm{19}}^1\times {\mathrm{659}}^1$

素因数の和:700

約数の個数: 48

約数和(自身を含む): 38438400

約数和(自身を除く): 17140179

約数列:

[1, 3, 7, 9, 19, 21, 27, 57, 63, 81, 133, 171, 189, 243, 399, 513, 567, 659, 1197, 1539, 1701, 1977, 3591, 4613, 4617, 5931, 10773, 12521, 13839, 17793, 32319, 37563, 41517, 53379, 87647, 112689, 124551, 160137, 262941, 338067, 373653, 788823, 1014201, 1120959, 2366469, 3042603, 7099407, 21298221]

約数ペア:

[(1, 21298221), (3, 7099407), (7, 3042603), (9, 2366469), (19, 1120959), (21, 1014201), (27, 788823), (57, 373653), (63, 338067), (81, 262941), (133, 160137), (171, 124551), (189, 112689), (243, 87647), (399, 53379), (513, 41517), (567, 37563), (659, 32319), (1197, 17793), (1539, 13839), (1701, 12521), (1977, 10773), (3591, 5931), (4613, 4617)]