20819420

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7489}}^1$

素因数の和:7637

約数の個数: 24

約数和(自身を含む): 44041200

約数和(自身を除く): 23221780

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7489, 14978, 29956, 37445, 74890, 149780, 1040971, 2081942, 4163884, 5204855, 10409710, 20819420]

約数ペア:

[(1, 20819420), (2, 10409710), (4, 5204855), (5, 4163884), (10, 2081942), (20, 1040971), (139, 149780), (278, 74890), (556, 37445), (695, 29956), (1390, 14978), (2780, 7489)]