21237680

素因数分解:

$2^4\times 5^1\times {\mathrm{265471}}^1$

素因数の和:265484

約数の個数: 20

約数和(自身を含む): 49377792

約数和(自身を除く): 28140112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265471, 530942, 1061884, 1327355, 2123768, 2654710, 4247536, 5309420, 10618840, 21237680]

約数ペア:

[(1, 21237680), (2, 10618840), (4, 5309420), (5, 4247536), (8, 2654710), (10, 2123768), (16, 1327355), (20, 1061884), (40, 530942), (80, 265471)]