19912556

素因数分解:

$2^2\times {\mathrm{109}}^2\times {\mathrm{419}}^1$

素因数の和:641

約数の個数: 18

約数和(自身を含む): 35253540

約数和(自身を除く): 15340984

約数列:

[1, 2, 4, 109, 218, 419, 436, 838, 1676, 11881, 23762, 45671, 47524, 91342, 182684, 4978139, 9956278, 19912556]

約数ペア:

[(1, 19912556), (2, 9956278), (4, 4978139), (109, 182684), (218, 91342), (419, 47524), (436, 45671), (838, 23762), (1676, 11881)]