21939580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{6491}}^1$

素因数の和:6526

約数の個数: 36

約数和(自身を含む): 49897512

約数和(自身を除く): 27957932

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 169, 260, 338, 676, 845, 1690, 3380, 6491, 12982, 25964, 32455, 64910, 84383, 129820, 168766, 337532, 421915, 843830, 1096979, 1687660, 2193958, 4387916, 5484895, 10969790, 21939580]

約数ペア:

[(1, 21939580), (2, 10969790), (4, 5484895), (5, 4387916), (10, 2193958), (13, 1687660), (20, 1096979), (26, 843830), (52, 421915), (65, 337532), (130, 168766), (169, 129820), (260, 84383), (338, 64910), (676, 32455), (845, 25964), (1690, 12982), (3380, 6491)]