21089990

素因数分解:

$2^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{51439}}^1$

素因数の和:51487

約数の個数: 16

約数和(自身を含む): 38888640

約数和(自身を除く): 17798650

約数列:

[1, 2, 5, 10, 41, 82, 205, 410, 51439, 102878, 257195, 514390, 2108999, 4217998, 10544995, 21089990]

約数ペア:

[(1, 21089990), (2, 10544995), (5, 4217998), (10, 2108999), (41, 514390), (82, 257195), (205, 102878), (410, 51439)]