21355155

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{439}}^1$

素因数の和:520

約数の個数: 48

約数和(自身を含む): 39536640

約数和(自身を除く): 18181485

約数列:

[1, 3, 5, 9, 15, 23, 45, 47, 69, 115, 141, 207, 235, 345, 423, 439, 705, 1035, 1081, 1317, 2115, 2195, 3243, 3951, 5405, 6585, 9729, 10097, 16215, 19755, 20633, 30291, 48645, 50485, 61899, 90873, 103165, 151455, 185697, 309495, 454365, 474559, 928485, 1423677, 2372795, 4271031, 7118385, 21355155]

約数ペア:

[(1, 21355155), (3, 7118385), (5, 4271031), (9, 2372795), (15, 1423677), (23, 928485), (45, 474559), (47, 454365), (69, 309495), (115, 185697), (141, 151455), (207, 103165), (235, 90873), (345, 61899), (423, 50485), (439, 48645), (705, 30291), (1035, 20633), (1081, 19755), (1317, 16215), (2115, 10097), (2195, 9729), (3243, 6585), (3951, 5405)]