20728525

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{19}}^1\times {\mathrm{151}}^1$

素因数の和:214

約数の個数: 36

約数和(自身を含む): 28931680

約数和(自身を除く): 8203155

約数列:

[1, 5, 17, 19, 25, 85, 95, 151, 289, 323, 425, 475, 755, 1445, 1615, 2567, 2869, 3775, 5491, 7225, 8075, 12835, 14345, 27455, 43639, 48773, 64175, 71725, 137275, 218195, 243865, 829141, 1090975, 1219325, 4145705, 20728525]

約数ペア:

[(1, 20728525), (5, 4145705), (17, 1219325), (19, 1090975), (25, 829141), (85, 243865), (95, 218195), (151, 137275), (289, 71725), (323, 64175), (425, 48773), (475, 43639), (755, 27455), (1445, 14345), (1615, 12835), (2567, 8075), (2869, 7225), (3775, 5491)]