21990970

素因数分解:

$2^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{16787}}^1$

素因数の和:16925

約数の個数: 16

約数和(自身を含む): 39888288

約数和(自身を除く): 17897318

約数列:

[1, 2, 5, 10, 131, 262, 655, 1310, 16787, 33574, 83935, 167870, 2199097, 4398194, 10995485, 21990970]

約数ペア:

[(1, 21990970), (2, 10995485), (5, 4398194), (10, 2199097), (131, 167870), (262, 83935), (655, 33574), (1310, 16787)]