21129780

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{7187}}^1$

素因数の和:7213

約数の個数: 72

約数和(自身を含む): 68832288

約数和(自身を除く): 47702508

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 420, 490, 588, 735, 980, 1470, 2940, 7187, 14374, 21561, 28748, 35935, 43122, 50309, 71870, 86244, 100618, 107805, 143740, 150927, 201236, 215610, 251545, 301854, 352163, 431220, 503090, 603708, 704326, 754635, 1006180, 1056489, 1408652, 1509270, 1760815, 2112978, 3018540, 3521630, 4225956, 5282445, 7043260, 10564890, 21129780]

約数ペア:

[(1, 21129780), (2, 10564890), (3, 7043260), (4, 5282445), (5, 4225956), (6, 3521630), (7, 3018540), (10, 2112978), (12, 1760815), (14, 1509270), (15, 1408652), (20, 1056489), (21, 1006180), (28, 754635), (30, 704326), (35, 603708), (42, 503090), (49, 431220), (60, 352163), (70, 301854), (84, 251545), (98, 215610), (105, 201236), (140, 150927), (147, 143740), (196, 107805), (210, 100618), (245, 86244), (294, 71870), (420, 50309), (490, 43122), (588, 35935), (735, 28748), (980, 21561), (1470, 14374), (2940, 7187)]