20281905

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{31}}^2\times {\mathrm{67}}^1$

素因数の和:147

約数の個数: 72

約数和(自身を含む): 42134976

約数和(自身を除く): 21853071

約数列:

[1, 3, 5, 7, 9, 15, 21, 31, 35, 45, 63, 67, 93, 105, 155, 201, 217, 279, 315, 335, 465, 469, 603, 651, 961, 1005, 1085, 1395, 1407, 1953, 2077, 2345, 2883, 3015, 3255, 4221, 4805, 6231, 6727, 7035, 8649, 9765, 10385, 14415, 14539, 18693, 20181, 21105, 31155, 33635, 43245, 43617, 60543, 64387, 72695, 93465, 100905, 130851, 193161, 218085, 302715, 321935, 450709, 579483, 654255, 965805, 1352127, 2253545, 2897415, 4056381, 6760635, 20281905]

約数ペア:

[(1, 20281905), (3, 6760635), (5, 4056381), (7, 2897415), (9, 2253545), (15, 1352127), (21, 965805), (31, 654255), (35, 579483), (45, 450709), (63, 321935), (67, 302715), (93, 218085), (105, 193161), (155, 130851), (201, 100905), (217, 93465), (279, 72695), (315, 64387), (335, 60543), (465, 43617), (469, 43245), (603, 33635), (651, 31155), (961, 21105), (1005, 20181), (1085, 18693), (1395, 14539), (1407, 14415), (1953, 10385), (2077, 9765), (2345, 8649), (2883, 7035), (3015, 6727), (3255, 6231), (4221, 4805)]