21451780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{73}}^1\times {\mathrm{2099}}^1$

素因数の和:2188

約数の個数: 48

約数和(自身を含む): 52214400

約数和(自身を除く): 30762620

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 73, 140, 146, 292, 365, 511, 730, 1022, 1460, 2044, 2099, 2555, 4198, 5110, 8396, 10220, 10495, 14693, 20990, 29386, 41980, 58772, 73465, 146930, 153227, 293860, 306454, 612908, 766135, 1072589, 1532270, 2145178, 3064540, 4290356, 5362945, 10725890, 21451780]

約数ペア:

[(1, 21451780), (2, 10725890), (4, 5362945), (5, 4290356), (7, 3064540), (10, 2145178), (14, 1532270), (20, 1072589), (28, 766135), (35, 612908), (70, 306454), (73, 293860), (140, 153227), (146, 146930), (292, 73465), (365, 58772), (511, 41980), (730, 29386), (1022, 20990), (1460, 14693), (2044, 10495), (2099, 10220), (2555, 8396), (4198, 5110)]