20998705

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{347}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 33324480

約数和(自身を除く): 12325775

約数列:

[1, 5, 7, 13, 19, 35, 49, 65, 91, 95, 133, 245, 247, 347, 455, 637, 665, 931, 1235, 1729, 1735, 2429, 3185, 4511, 4655, 6593, 8645, 12103, 12145, 17003, 22555, 31577, 32965, 46151, 60515, 85015, 85709, 157885, 221039, 230755, 323057, 428545, 599963, 1105195, 1615285, 2999815, 4199741, 20998705]

約数ペア:

[(1, 20998705), (5, 4199741), (7, 2999815), (13, 1615285), (19, 1105195), (35, 599963), (49, 428545), (65, 323057), (91, 230755), (95, 221039), (133, 157885), (245, 85709), (247, 85015), (347, 60515), (455, 46151), (637, 32965), (665, 31577), (931, 22555), (1235, 17003), (1729, 12145), (1735, 12103), (2429, 8645), (3185, 6593), (4511, 4655)]