20845580

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{239}}^1$

素因数の和:351

約数の個数: 72

約数和(自身を含む): 51710400

約数和(自身を除く): 30864820

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 89, 98, 140, 178, 196, 239, 245, 356, 445, 478, 490, 623, 890, 956, 980, 1195, 1246, 1673, 1780, 2390, 2492, 3115, 3346, 4361, 4780, 6230, 6692, 8365, 8722, 11711, 12460, 16730, 17444, 21271, 21805, 23422, 33460, 42542, 43610, 46844, 58555, 85084, 87220, 106355, 117110, 148897, 212710, 234220, 297794, 425420, 595588, 744485, 1042279, 1488970, 2084558, 2977940, 4169116, 5211395, 10422790, 20845580]

約数ペア:

[(1, 20845580), (2, 10422790), (4, 5211395), (5, 4169116), (7, 2977940), (10, 2084558), (14, 1488970), (20, 1042279), (28, 744485), (35, 595588), (49, 425420), (70, 297794), (89, 234220), (98, 212710), (140, 148897), (178, 117110), (196, 106355), (239, 87220), (245, 85084), (356, 58555), (445, 46844), (478, 43610), (490, 42542), (623, 33460), (890, 23422), (956, 21805), (980, 21271), (1195, 17444), (1246, 16730), (1673, 12460), (1780, 11711), (2390, 8722), (2492, 8365), (3115, 6692), (3346, 6230), (4361, 4780)]