20900120

素因数分解:

$2^3\times 5^1\times {\mathrm{401}}^1\times {\mathrm{1303}}^1$

素因数の和:1715

約数の個数: 32

約数和(自身を含む): 47178720

約数和(自身を除く): 26278600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 401, 802, 1303, 1604, 2005, 2606, 3208, 4010, 5212, 6515, 8020, 10424, 13030, 16040, 26060, 52120, 522503, 1045006, 2090012, 2612515, 4180024, 5225030, 10450060, 20900120]

約数ペア:

[(1, 20900120), (2, 10450060), (4, 5225030), (5, 4180024), (8, 2612515), (10, 2090012), (20, 1045006), (40, 522503), (401, 52120), (802, 26060), (1303, 16040), (1604, 13030), (2005, 10424), (2606, 8020), (3208, 6515), (4010, 5212)]