21151940

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{55663}}^1$

素因数の和:55691

約数の個数: 24

約数和(自身を含む): 46757760

約数和(自身を除く): 25605820

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 55663, 111326, 222652, 278315, 556630, 1057597, 1113260, 2115194, 4230388, 5287985, 10575970, 21151940]

約数ペア:

[(1, 21151940), (2, 10575970), (4, 5287985), (5, 4230388), (10, 2115194), (19, 1113260), (20, 1057597), (38, 556630), (76, 278315), (95, 222652), (190, 111326), (380, 55663)]