21408540

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{509}}^1\times {\mathrm{701}}^1$

素因数の和:1222

約数の個数: 48

約数和(自身を含む): 60147360

約数和(自身を除く): 38738820

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 509, 701, 1018, 1402, 1527, 2036, 2103, 2545, 2804, 3054, 3505, 4206, 5090, 6108, 7010, 7635, 8412, 10180, 10515, 14020, 15270, 21030, 30540, 42060, 356809, 713618, 1070427, 1427236, 1784045, 2140854, 3568090, 4281708, 5352135, 7136180, 10704270, 21408540]

約数ペア:

[(1, 21408540), (2, 10704270), (3, 7136180), (4, 5352135), (5, 4281708), (6, 3568090), (10, 2140854), (12, 1784045), (15, 1427236), (20, 1070427), (30, 713618), (60, 356809), (509, 42060), (701, 30540), (1018, 21030), (1402, 15270), (1527, 14020), (2036, 10515), (2103, 10180), (2545, 8412), (2804, 7635), (3054, 7010), (3505, 6108), (4206, 5090)]