19900221

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{157}}^1\times {\mathrm{167}}^1$

素因数の和:361

約数の個数: 32

約数和(自身を含む): 30578688

約数和(自身を除く): 10678467

約数列:

[1, 3, 11, 23, 33, 69, 157, 167, 253, 471, 501, 759, 1727, 1837, 3611, 3841, 5181, 5511, 10833, 11523, 26219, 39721, 42251, 78657, 119163, 126753, 288409, 603037, 865227, 1809111, 6633407, 19900221]

約数ペア:

[(1, 19900221), (3, 6633407), (11, 1809111), (23, 865227), (33, 603037), (69, 288409), (157, 126753), (167, 119163), (253, 78657), (471, 42251), (501, 39721), (759, 26219), (1727, 11523), (1837, 10833), (3611, 5511), (3841, 5181)]