21290908

素因数分解:

$2^2\times {\mathrm{139}}^1\times {\mathrm{149}}^1\times {\mathrm{257}}^1$

素因数の和:549

約数の個数: 24

約数和(自身を含む): 37926000

約数和(自身を除く): 16635092

約数列:

[1, 2, 4, 139, 149, 257, 278, 298, 514, 556, 596, 1028, 20711, 35723, 38293, 41422, 71446, 76586, 82844, 142892, 153172, 5322727, 10645454, 21290908]

約数ペア:

[(1, 21290908), (2, 10645454), (4, 5322727), (139, 153172), (149, 142892), (257, 82844), (278, 76586), (298, 71446), (514, 41422), (556, 38293), (596, 35723), (1028, 20711)]