20981420

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{787}}^1$

素因数の和:870

約数の個数: 48

約数和(自身を含む): 46599168

約数和(自身を除く): 25617748

約数列:

[1, 2, 4, 5, 10, 20, 31, 43, 62, 86, 124, 155, 172, 215, 310, 430, 620, 787, 860, 1333, 1574, 2666, 3148, 3935, 5332, 6665, 7870, 13330, 15740, 24397, 26660, 33841, 48794, 67682, 97588, 121985, 135364, 169205, 243970, 338410, 487940, 676820, 1049071, 2098142, 4196284, 5245355, 10490710, 20981420]

約数ペア:

[(1, 20981420), (2, 10490710), (4, 5245355), (5, 4196284), (10, 2098142), (20, 1049071), (31, 676820), (43, 487940), (62, 338410), (86, 243970), (124, 169205), (155, 135364), (172, 121985), (215, 97588), (310, 67682), (430, 48794), (620, 33841), (787, 26660), (860, 24397), (1333, 15740), (1574, 13330), (2666, 7870), (3148, 6665), (3935, 5332)]