21005487

素因数分解:

$3^4\times {\mathrm{173}}^1\times {\mathrm{1499}}^1$

素因数の和:1684

約数の個数: 20

約数和(自身を含む): 31581000

約数和(自身を除く): 10575513

約数列:

[1, 3, 9, 27, 81, 173, 519, 1499, 1557, 4497, 4671, 13491, 14013, 40473, 121419, 259327, 777981, 2333943, 7001829, 21005487]

約数ペア:

[(1, 21005487), (3, 7001829), (9, 2333943), (27, 777981), (81, 259327), (173, 121419), (519, 40473), (1499, 14013), (1557, 13491), (4497, 4671)]