21990645

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{21247}}^1$

素因数の和:21281

約数の個数: 24

約数和(自身を含む): 39776256

約数和(自身を除く): 17785611

約数列:

[1, 3, 5, 9, 15, 23, 45, 69, 115, 207, 345, 1035, 21247, 63741, 106235, 191223, 318705, 488681, 956115, 1466043, 2443405, 4398129, 7330215, 21990645]

約数ペア:

[(1, 21990645), (3, 7330215), (5, 4398129), (9, 2443405), (15, 1466043), (23, 956115), (45, 488681), (69, 318705), (115, 191223), (207, 106235), (345, 63741), (1035, 21247)]