21958780

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{439}}^1$

素因数の和:550

約数の個数: 48

約数和(自身を含む): 48121920

約数和(自身を除く): 26163140

約数列:

[1, 2, 4, 5, 10, 20, 41, 61, 82, 122, 164, 205, 244, 305, 410, 439, 610, 820, 878, 1220, 1756, 2195, 2501, 4390, 5002, 8780, 10004, 12505, 17999, 25010, 26779, 35998, 50020, 53558, 71996, 89995, 107116, 133895, 179990, 267790, 359980, 535580, 1097939, 2195878, 4391756, 5489695, 10979390, 21958780]

約数ペア:

[(1, 21958780), (2, 10979390), (4, 5489695), (5, 4391756), (10, 2195878), (20, 1097939), (41, 535580), (61, 359980), (82, 267790), (122, 179990), (164, 133895), (205, 107116), (244, 89995), (305, 71996), (410, 53558), (439, 50020), (610, 35998), (820, 26779), (878, 25010), (1220, 17999), (1756, 12505), (2195, 10004), (2501, 8780), (4390, 5002)]