20805005

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{331}}^1\times {\mathrm{967}}^1$

素因数の和:1316

約数の個数: 16

約数和(自身を含む): 26995584

約数和(自身を除く): 6190579

約数列:

[1, 5, 13, 65, 331, 967, 1655, 4303, 4835, 12571, 21515, 62855, 320077, 1600385, 4161001, 20805005]

約数ペア:

[(1, 20805005), (5, 4161001), (13, 1600385), (65, 320077), (331, 62855), (967, 21515), (1655, 12571), (4303, 4835)]