21990759

素因数分解:

$3^1\times 7^4\times {\mathrm{43}}^1\times {\mathrm{71}}^1$

素因数の和:145

約数の個数: 40

約数和(自身を含む): 35494272

約数和(自身を除く): 13503513

約数列:

[1, 3, 7, 21, 43, 49, 71, 129, 147, 213, 301, 343, 497, 903, 1029, 1491, 2107, 2401, 3053, 3479, 6321, 7203, 9159, 10437, 14749, 21371, 24353, 44247, 64113, 73059, 103243, 149597, 170471, 309729, 448791, 511413, 1047179, 3141537, 7330253, 21990759]

約数ペア:

[(1, 21990759), (3, 7330253), (7, 3141537), (21, 1047179), (43, 511413), (49, 448791), (71, 309729), (129, 170471), (147, 149597), (213, 103243), (301, 73059), (343, 64113), (497, 44247), (903, 24353), (1029, 21371), (1491, 14749), (2107, 10437), (2401, 9159), (3053, 7203), (3479, 6321)]