20128900

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{631}}^1$

素因数の和:685

約数の個数: 72

約数和(自身を含む): 49371840

約数和(自身を除く): 29242940

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 29, 44, 50, 55, 58, 100, 110, 116, 145, 220, 275, 290, 319, 550, 580, 631, 638, 725, 1100, 1262, 1276, 1450, 1595, 2524, 2900, 3155, 3190, 6310, 6380, 6941, 7975, 12620, 13882, 15775, 15950, 18299, 27764, 31550, 31900, 34705, 36598, 63100, 69410, 73196, 91495, 138820, 173525, 182990, 201289, 347050, 365980, 402578, 457475, 694100, 805156, 914950, 1006445, 1829900, 2012890, 4025780, 5032225, 10064450, 20128900]

約数ペア:

[(1, 20128900), (2, 10064450), (4, 5032225), (5, 4025780), (10, 2012890), (11, 1829900), (20, 1006445), (22, 914950), (25, 805156), (29, 694100), (44, 457475), (50, 402578), (55, 365980), (58, 347050), (100, 201289), (110, 182990), (116, 173525), (145, 138820), (220, 91495), (275, 73196), (290, 69410), (319, 63100), (550, 36598), (580, 34705), (631, 31900), (638, 31550), (725, 27764), (1100, 18299), (1262, 15950), (1276, 15775), (1450, 13882), (1595, 12620), (2524, 7975), (2900, 6941), (3155, 6380), (3190, 6310)]