81721770

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{209543}}^1$

素因数の和:209566

約数の個数: 32

約数和(自身を含む): 211220352

約数和(自身を除く): 129498582

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 209543, 419086, 628629, 1047715, 1257258, 2095430, 2724059, 3143145, 5448118, 6286290, 8172177, 13620295, 16344354, 27240590, 40860885, 81721770]

約数ペア:

[(1, 81721770), (2, 40860885), (3, 27240590), (5, 16344354), (6, 13620295), (10, 8172177), (13, 6286290), (15, 5448118), (26, 3143145), (30, 2724059), (39, 2095430), (65, 1257258), (78, 1047715), (130, 628629), (195, 419086), (390, 209543)]