21005680

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{1889}}^1$

素因数の和:2041

約数の個数: 40

約数和(自身を含む): 49215600

約数和(自身を除く): 28209920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 1889, 2224, 2780, 3778, 5560, 7556, 9445, 11120, 15112, 18890, 30224, 37780, 75560, 151120, 262571, 525142, 1050284, 1312855, 2100568, 2625710, 4201136, 5251420, 10502840, 21005680]

約数ペア:

[(1, 21005680), (2, 10502840), (4, 5251420), (5, 4201136), (8, 2625710), (10, 2100568), (16, 1312855), (20, 1050284), (40, 525142), (80, 262571), (139, 151120), (278, 75560), (556, 37780), (695, 30224), (1112, 18890), (1390, 15112), (1889, 11120), (2224, 9445), (2780, 7556), (3778, 5560)]