21457808

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{78889}}^1$

素因数の和:78914

約数の個数: 20

約数和(自身を含む): 44020620

約数和(自身を除く): 22562812

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 78889, 157778, 315556, 631112, 1262224, 1341113, 2682226, 5364452, 10728904, 21457808]

約数ペア:

[(1, 21457808), (2, 10728904), (4, 5364452), (8, 2682226), (16, 1341113), (17, 1262224), (34, 631112), (68, 315556), (136, 157778), (272, 78889)]