21009040

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20201}}^1$

素因数の和:20227

約数の個数: 40

約数和(自身を含む): 52606008

約数和(自身を除く): 31596968

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20201, 40402, 80804, 101005, 161608, 202010, 262613, 323216, 404020, 525226, 808040, 1050452, 1313065, 1616080, 2100904, 2626130, 4201808, 5252260, 10504520, 21009040]

約数ペア:

[(1, 21009040), (2, 10504520), (4, 5252260), (5, 4201808), (8, 2626130), (10, 2100904), (13, 1616080), (16, 1313065), (20, 1050452), (26, 808040), (40, 525226), (52, 404020), (65, 323216), (80, 262613), (104, 202010), (130, 161608), (208, 101005), (260, 80804), (520, 40402), (1040, 20201)]