28678915

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{89}}^1\times {\mathrm{223}}^1$

素因数の和:351

約数の個数: 24

約数和(自身を含む): 37134720

約数和(自身を除く): 8455805

約数列:

[1, 5, 17, 85, 89, 223, 289, 445, 1115, 1445, 1513, 3791, 7565, 18955, 19847, 25721, 64447, 99235, 128605, 322235, 337399, 1686995, 5735783, 28678915]

約数ペア:

[(1, 28678915), (5, 5735783), (17, 1686995), (85, 337399), (89, 322235), (223, 128605), (289, 99235), (445, 64447), (1115, 25721), (1445, 19847), (1513, 18955), (3791, 7565)]