19968921

素因数分解:

$3^2\times 7^2\times {\mathrm{45281}}^1$

素因数の和:45301

約数の個数: 18

約数和(自身を含む): 33553962

約数和(自身を除く): 13585041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 45281, 135843, 316967, 407529, 950901, 2218769, 2852703, 6656307, 19968921]

約数ペア:

[(1, 19968921), (3, 6656307), (7, 2852703), (9, 2218769), (21, 950901), (49, 407529), (63, 316967), (147, 135843), (441, 45281)]