18780741

素因数分解:

$3^5\times 7^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1$

素因数の和:264

約数の個数: 48

約数和(自身を含む): 32859008

約数和(自身を除く): 14078267

約数列:

[1, 3, 7, 9, 21, 27, 61, 63, 81, 181, 183, 189, 243, 427, 543, 549, 567, 1267, 1281, 1629, 1647, 1701, 3801, 3843, 4887, 4941, 11041, 11403, 11529, 14661, 14823, 33123, 34209, 34587, 43983, 77287, 99369, 102627, 103761, 231861, 298107, 307881, 695583, 894321, 2086749, 2682963, 6260247, 18780741]

約数ペア:

[(1, 18780741), (3, 6260247), (7, 2682963), (9, 2086749), (21, 894321), (27, 695583), (61, 307881), (63, 298107), (81, 231861), (181, 103761), (183, 102627), (189, 99369), (243, 77287), (427, 43983), (543, 34587), (549, 34209), (567, 33123), (1267, 14823), (1281, 14661), (1629, 11529), (1647, 11403), (1701, 11041), (3801, 4941), (3843, 4887)]