21039980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80923}}^1$

素因数の和:80945

約数の個数: 24

約数和(自身を含む): 47583312

約数和(自身を除く): 26543332

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80923, 161846, 323692, 404615, 809230, 1051999, 1618460, 2103998, 4207996, 5259995, 10519990, 21039980]

約数ペア:

[(1, 21039980), (2, 10519990), (4, 5259995), (5, 4207996), (10, 2103998), (13, 1618460), (20, 1051999), (26, 809230), (52, 404615), (65, 323692), (130, 161846), (260, 80923)]