21129340

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{311}}^1$

素因数の和:442

約数の個数: 48

約数和(自身を含む): 46126080

約数和(自身を除く): 24996740

約数列:

[1, 2, 4, 5, 10, 20, 43, 79, 86, 158, 172, 215, 311, 316, 395, 430, 622, 790, 860, 1244, 1555, 1580, 3110, 3397, 6220, 6794, 13373, 13588, 16985, 24569, 26746, 33970, 49138, 53492, 66865, 67940, 98276, 122845, 133730, 245690, 267460, 491380, 1056467, 2112934, 4225868, 5282335, 10564670, 21129340]

約数ペア:

[(1, 21129340), (2, 10564670), (4, 5282335), (5, 4225868), (10, 2112934), (20, 1056467), (43, 491380), (79, 267460), (86, 245690), (158, 133730), (172, 122845), (215, 98276), (311, 67940), (316, 66865), (395, 53492), (430, 49138), (622, 33970), (790, 26746), (860, 24569), (1244, 16985), (1555, 13588), (1580, 13373), (3110, 6794), (3397, 6220)]