21256389

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{829}}^1$

素因数の和:890

約数の個数: 48

約数和(自身を含む): 39361920

約数和(自身を除く): 18105531

約数列:

[1, 3, 7, 9, 11, 21, 33, 37, 63, 77, 99, 111, 231, 259, 333, 407, 693, 777, 829, 1221, 2331, 2487, 2849, 3663, 5803, 7461, 8547, 9119, 17409, 25641, 27357, 30673, 52227, 63833, 82071, 92019, 191499, 214711, 276057, 337403, 574497, 644133, 1012209, 1932399, 2361821, 3036627, 7085463, 21256389]

約数ペア:

[(1, 21256389), (3, 7085463), (7, 3036627), (9, 2361821), (11, 1932399), (21, 1012209), (33, 644133), (37, 574497), (63, 337403), (77, 276057), (99, 214711), (111, 191499), (231, 92019), (259, 82071), (333, 63833), (407, 52227), (693, 30673), (777, 27357), (829, 25641), (1221, 17409), (2331, 9119), (2487, 8547), (2849, 7461), (3663, 5803)]