21158780

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{55681}}^1$

素因数の和:55709

約数の個数: 24

約数和(自身を含む): 46772880

約数和(自身を除く): 25614100

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 55681, 111362, 222724, 278405, 556810, 1057939, 1113620, 2115878, 4231756, 5289695, 10579390, 21158780]

約数ペア:

[(1, 21158780), (2, 10579390), (4, 5289695), (5, 4231756), (10, 2115878), (19, 1113620), (20, 1057939), (38, 556810), (76, 278405), (95, 222724), (190, 111362), (380, 55681)]