21278215

素因数分解:

$5^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{4787}}^1$

素因数の和:4926

約数の個数: 16

約数和(自身を含む): 29417472

約数和(自身を除く): 8139257

約数列:

[1, 5, 7, 35, 127, 635, 889, 4445, 4787, 23935, 33509, 167545, 607949, 3039745, 4255643, 21278215]

約数ペア:

[(1, 21278215), (5, 4255643), (7, 3039745), (35, 607949), (127, 167545), (635, 33509), (889, 23935), (4445, 4787)]