21247090

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{68539}}^1$

素因数の和:68577

約数の個数: 16

約数和(自身を含む): 39479040

約数和(自身を除く): 18231950

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 68539, 137078, 342695, 685390, 2124709, 4249418, 10623545, 21247090]

約数ペア:

[(1, 21247090), (2, 10623545), (5, 4249418), (10, 2124709), (31, 685390), (62, 342695), (155, 137078), (310, 68539)]