21672080

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4441}}^1$

素因数の和:4515

約数の個数: 40

約数和(自身を含む): 51225144

約数和(自身を除く): 29553064

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4441, 4880, 8882, 17764, 22205, 35528, 44410, 71056, 88820, 177640, 270901, 355280, 541802, 1083604, 1354505, 2167208, 2709010, 4334416, 5418020, 10836040, 21672080]

約数ペア:

[(1, 21672080), (2, 10836040), (4, 5418020), (5, 4334416), (8, 2709010), (10, 2167208), (16, 1354505), (20, 1083604), (40, 541802), (61, 355280), (80, 270901), (122, 177640), (244, 88820), (305, 71056), (488, 44410), (610, 35528), (976, 22205), (1220, 17764), (2440, 8882), (4441, 4880)]