20965980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{49919}}^1$

素因数の和:49938

約数の個数: 48

約数和(自身を含む): 67092480

約数和(自身を除く): 46126500

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 49919, 99838, 149757, 199676, 249595, 299514, 349433, 499190, 599028, 698866, 748785, 998380, 1048299, 1397732, 1497570, 1747165, 2096598, 2995140, 3494330, 4193196, 5241495, 6988660, 10482990, 20965980]

約数ペア:

[(1, 20965980), (2, 10482990), (3, 6988660), (4, 5241495), (5, 4193196), (6, 3494330), (7, 2995140), (10, 2096598), (12, 1747165), (14, 1497570), (15, 1397732), (20, 1048299), (21, 998380), (28, 748785), (30, 698866), (35, 599028), (42, 499190), (60, 349433), (70, 299514), (84, 249595), (105, 199676), (140, 149757), (210, 99838), (420, 49919)]