21107780

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{19913}}^1$

素因数の和:19975

約数の個数: 24

約数和(自身を含む): 45164952

約数和(自身を除く): 24057172

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 212, 265, 530, 1060, 19913, 39826, 79652, 99565, 199130, 398260, 1055389, 2110778, 4221556, 5276945, 10553890, 21107780]

約数ペア:

[(1, 21107780), (2, 10553890), (4, 5276945), (5, 4221556), (10, 2110778), (20, 1055389), (53, 398260), (106, 199130), (212, 99565), (265, 79652), (530, 39826), (1060, 19913)]