81287380

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{66629}}^1$

素因数の和:66699

約数の個数: 24

約数和(自身を含む): 173504520

約数和(自身を除く): 92217140

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 66629, 133258, 266516, 333145, 666290, 1332580, 4064369, 8128738, 16257476, 20321845, 40643690, 81287380]

約数ペア:

[(1, 81287380), (2, 40643690), (4, 20321845), (5, 16257476), (10, 8128738), (20, 4064369), (61, 1332580), (122, 666290), (244, 333145), (305, 266516), (610, 133258), (1220, 66629)]