19983789

素因数分解:

$3^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{397}}^1$

素因数の和:474

約数の個数: 48

約数和(自身を含む): 35762688

約数和(自身を除く): 15778899

約数列:

[1, 3, 7, 9, 17, 21, 47, 51, 63, 119, 141, 153, 329, 357, 397, 423, 799, 987, 1071, 1191, 2397, 2779, 2961, 3573, 5593, 6749, 7191, 8337, 16779, 18659, 20247, 25011, 47243, 50337, 55977, 60741, 130613, 141729, 167931, 317203, 391839, 425187, 951609, 1175517, 2220421, 2854827, 6661263, 19983789]

約数ペア:

[(1, 19983789), (3, 6661263), (7, 2854827), (9, 2220421), (17, 1175517), (21, 951609), (47, 425187), (51, 391839), (63, 317203), (119, 167931), (141, 141729), (153, 130613), (329, 60741), (357, 55977), (397, 50337), (423, 47243), (799, 25011), (987, 20247), (1071, 18659), (1191, 16779), (2397, 8337), (2779, 7191), (2961, 6749), (3573, 5593)]