20978840

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12197}}^1$

素因数の和:12251

約数の個数: 32

約数和(自身を含む): 48304080

約数和(自身を除く): 27325240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12197, 24394, 48788, 60985, 97576, 121970, 243940, 487880, 524471, 1048942, 2097884, 2622355, 4195768, 5244710, 10489420, 20978840]

約数ペア:

[(1, 20978840), (2, 10489420), (4, 5244710), (5, 4195768), (8, 2622355), (10, 2097884), (20, 1048942), (40, 524471), (43, 487880), (86, 243940), (172, 121970), (215, 97576), (344, 60985), (430, 48788), (860, 24394), (1720, 12197)]