21656240

素因数分解:

$2^4\times 5^1\times {\mathrm{421}}^1\times {\mathrm{643}}^1$

素因数の和:1077

約数の個数: 40

約数和(自身を含む): 50548848

約数和(自身を除く): 28892608

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 421, 643, 842, 1286, 1684, 2105, 2572, 3215, 3368, 4210, 5144, 6430, 6736, 8420, 10288, 12860, 16840, 25720, 33680, 51440, 270703, 541406, 1082812, 1353515, 2165624, 2707030, 4331248, 5414060, 10828120, 21656240]

約数ペア:

[(1, 21656240), (2, 10828120), (4, 5414060), (5, 4331248), (8, 2707030), (10, 2165624), (16, 1353515), (20, 1082812), (40, 541406), (80, 270703), (421, 51440), (643, 33680), (842, 25720), (1286, 16840), (1684, 12860), (2105, 10288), (2572, 8420), (3215, 6736), (3368, 6430), (4210, 5144)]