21078540

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16729}}^1$

素因数の和:16751

約数の個数: 72

約数和(自身を含む): 73076640

約数和(自身を除く): 51998100

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16729, 33458, 50187, 66916, 83645, 100374, 117103, 150561, 167290, 200748, 234206, 250935, 301122, 334580, 351309, 468412, 501870, 585515, 602244, 702618, 752805, 1003740, 1053927, 1171030, 1405236, 1505610, 1756545, 2107854, 2342060, 3011220, 3513090, 4215708, 5269635, 7026180, 10539270, 21078540]

約数ペア:

[(1, 21078540), (2, 10539270), (3, 7026180), (4, 5269635), (5, 4215708), (6, 3513090), (7, 3011220), (9, 2342060), (10, 2107854), (12, 1756545), (14, 1505610), (15, 1405236), (18, 1171030), (20, 1053927), (21, 1003740), (28, 752805), (30, 702618), (35, 602244), (36, 585515), (42, 501870), (45, 468412), (60, 351309), (63, 334580), (70, 301122), (84, 250935), (90, 234206), (105, 200748), (126, 167290), (140, 150561), (180, 117103), (210, 100374), (252, 83645), (315, 66916), (420, 50187), (630, 33458), (1260, 16729)]