19720025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{1291}}^1$

素因数の和:1361

約数の個数: 24

約数和(自身を含む): 26914944

約数和(自身を除く): 7194919

約数列:

[1, 5, 13, 25, 47, 65, 235, 325, 611, 1175, 1291, 3055, 6455, 15275, 16783, 32275, 60677, 83915, 303385, 419575, 788801, 1516925, 3944005, 19720025]

約数ペア:

[(1, 19720025), (5, 3944005), (13, 1516925), (25, 788801), (47, 419575), (65, 303385), (235, 83915), (325, 60677), (611, 32275), (1175, 16783), (1291, 15275), (3055, 6455)]