20855961

素因数分解:

$3^6\times 7^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1$

素因数の和:153

約数の個数: 56

約数和(自身を含む): 36864704

約数和(自身を除く): 16008743

約数列:

[1, 3, 7, 9, 21, 27, 61, 63, 67, 81, 183, 189, 201, 243, 427, 469, 549, 567, 603, 729, 1281, 1407, 1647, 1701, 1809, 3843, 4087, 4221, 4941, 5103, 5427, 11529, 12261, 12663, 14823, 16281, 28609, 34587, 36783, 37989, 44469, 48843, 85827, 103761, 110349, 113967, 257481, 311283, 331047, 341901, 772443, 993141, 2317329, 2979423, 6951987, 20855961]

約数ペア:

[(1, 20855961), (3, 6951987), (7, 2979423), (9, 2317329), (21, 993141), (27, 772443), (61, 341901), (63, 331047), (67, 311283), (81, 257481), (183, 113967), (189, 110349), (201, 103761), (243, 85827), (427, 48843), (469, 44469), (549, 37989), (567, 36783), (603, 34587), (729, 28609), (1281, 16281), (1407, 14823), (1647, 12663), (1701, 12261), (1809, 11529), (3843, 5427), (4087, 5103), (4221, 4941)]