21989268

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1229}}^1$

素因数の和:1317

約数の個数: 72

約数和(自身を含む): 64471680

約数和(自身を除く): 42482412

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 71, 84, 126, 142, 213, 252, 284, 426, 497, 639, 852, 994, 1229, 1278, 1491, 1988, 2458, 2556, 2982, 3687, 4473, 4916, 5964, 7374, 8603, 8946, 11061, 14748, 17206, 17892, 22122, 25809, 34412, 44244, 51618, 77427, 87259, 103236, 154854, 174518, 261777, 309708, 349036, 523554, 610813, 785331, 1047108, 1221626, 1570662, 1832439, 2443252, 3141324, 3664878, 5497317, 7329756, 10994634, 21989268]

約数ペア:

[(1, 21989268), (2, 10994634), (3, 7329756), (4, 5497317), (6, 3664878), (7, 3141324), (9, 2443252), (12, 1832439), (14, 1570662), (18, 1221626), (21, 1047108), (28, 785331), (36, 610813), (42, 523554), (63, 349036), (71, 309708), (84, 261777), (126, 174518), (142, 154854), (213, 103236), (252, 87259), (284, 77427), (426, 51618), (497, 44244), (639, 34412), (852, 25809), (994, 22122), (1229, 17892), (1278, 17206), (1491, 14748), (1988, 11061), (2458, 8946), (2556, 8603), (2982, 7374), (3687, 5964), (4473, 4916)]