21359728

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{997}}^1$

素因数の和:1121

約数の個数: 40

約数和(自身を含む): 45045728

約数和(自身を除く): 23686000

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 103, 104, 206, 208, 412, 824, 997, 1339, 1648, 1994, 2678, 3988, 5356, 7976, 10712, 12961, 15952, 21424, 25922, 51844, 102691, 103688, 205382, 207376, 410764, 821528, 1334983, 1643056, 2669966, 5339932, 10679864, 21359728]

約数ペア:

[(1, 21359728), (2, 10679864), (4, 5339932), (8, 2669966), (13, 1643056), (16, 1334983), (26, 821528), (52, 410764), (103, 207376), (104, 205382), (206, 103688), (208, 102691), (412, 51844), (824, 25922), (997, 21424), (1339, 15952), (1648, 12961), (1994, 10712), (2678, 7976), (3988, 5356)]