21501991

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{1789}}^1$

素因数の和:1914

約数の個数: 16

約数和(自身を含む): 26291520

約数和(自身を除く): 4789529

約数列:

[1, 7, 17, 101, 119, 707, 1717, 1789, 12019, 12523, 30413, 180689, 212891, 1264823, 3071713, 21501991]

約数ペア:

[(1, 21501991), (7, 3071713), (17, 1264823), (101, 212891), (119, 180689), (707, 30413), (1717, 12523), (1789, 12019)]