21420203

素因数分解:

$7^2\times {\mathrm{47}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:263

約数の個数: 24

約数和(自身を含む): 26002944

約数和(自身を除く): 4582741

約数列:

[1, 7, 47, 49, 71, 131, 329, 497, 917, 2303, 3337, 3479, 6157, 6419, 9301, 23359, 43099, 65107, 163513, 301693, 437147, 455749, 3060029, 21420203]

約数ペア:

[(1, 21420203), (7, 3060029), (47, 455749), (49, 437147), (71, 301693), (131, 163513), (329, 65107), (497, 43099), (917, 23359), (2303, 9301), (3337, 6419), (3479, 6157)]