20781900

素因数分解:

$2^2\times 3^3\times 5^2\times {\mathrm{43}}^1\times {\mathrm{179}}^1$

素因数の和:245

約数の個数: 144

約数和(自身を含む): 68745600

約数和(自身を除く): 47963700

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 27, 30, 36, 43, 45, 50, 54, 60, 75, 86, 90, 100, 108, 129, 135, 150, 172, 179, 180, 215, 225, 258, 270, 300, 358, 387, 430, 450, 516, 537, 540, 645, 675, 716, 774, 860, 895, 900, 1074, 1075, 1161, 1290, 1350, 1548, 1611, 1790, 1935, 2148, 2150, 2322, 2580, 2685, 2700, 3222, 3225, 3580, 3870, 4300, 4475, 4644, 4833, 5370, 5805, 6444, 6450, 7697, 7740, 8055, 8950, 9666, 9675, 10740, 11610, 12900, 13425, 15394, 16110, 17900, 19332, 19350, 23091, 23220, 24165, 26850, 29025, 30788, 32220, 38485, 38700, 40275, 46182, 48330, 53700, 58050, 69273, 76970, 80550, 92364, 96660, 115455, 116100, 120825, 138546, 153940, 161100, 192425, 207819, 230910, 241650, 277092, 346365, 384850, 415638, 461820, 483300, 577275, 692730, 769700, 831276, 1039095, 1154550, 1385460, 1731825, 2078190, 2309100, 3463650, 4156380, 5195475, 6927300, 10390950, 20781900]

約数ペア:

[(1, 20781900), (2, 10390950), (3, 6927300), (4, 5195475), (5, 4156380), (6, 3463650), (9, 2309100), (10, 2078190), (12, 1731825), (15, 1385460), (18, 1154550), (20, 1039095), (25, 831276), (27, 769700), (30, 692730), (36, 577275), (43, 483300), (45, 461820), (50, 415638), (54, 384850), (60, 346365), (75, 277092), (86, 241650), (90, 230910), (100, 207819), (108, 192425), (129, 161100), (135, 153940), (150, 138546), (172, 120825), (179, 116100), (180, 115455), (215, 96660), (225, 92364), (258, 80550), (270, 76970), (300, 69273), (358, 58050), (387, 53700), (430, 48330), (450, 46182), (516, 40275), (537, 38700), (540, 38485), (645, 32220), (675, 30788), (716, 29025), (774, 26850), (860, 24165), (895, 23220), (900, 23091), (1074, 19350), (1075, 19332), (1161, 17900), (1290, 16110), (1350, 15394), (1548, 13425), (1611, 12900), (1790, 11610), (1935, 10740), (2148, 9675), (2150, 9666), (2322, 8950), (2580, 8055), (2685, 7740), (2700, 7697), (3222, 6450), (3225, 6444), (3580, 5805), (3870, 5370), (4300, 4833), (4475, 4644)]