19851380

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{563}}^1$

素因数の和:656

約数の個数: 48

約数和(自身を含む): 43775424

約数和(自身を除く): 23924044

約数列:

[1, 2, 4, 5, 10, 20, 41, 43, 82, 86, 164, 172, 205, 215, 410, 430, 563, 820, 860, 1126, 1763, 2252, 2815, 3526, 5630, 7052, 8815, 11260, 17630, 23083, 24209, 35260, 46166, 48418, 92332, 96836, 115415, 121045, 230830, 242090, 461660, 484180, 992569, 1985138, 3970276, 4962845, 9925690, 19851380]

約数ペア:

[(1, 19851380), (2, 9925690), (4, 4962845), (5, 3970276), (10, 1985138), (20, 992569), (41, 484180), (43, 461660), (82, 242090), (86, 230830), (164, 121045), (172, 115415), (205, 96836), (215, 92332), (410, 48418), (430, 46166), (563, 35260), (820, 24209), (860, 23083), (1126, 17630), (1763, 11260), (2252, 8815), (2815, 7052), (3526, 5630)]