21665440

素因数分解:

$2^5\times 5^1\times {\mathrm{135409}}^1$

素因数の和:135424

約数の個数: 24

約数和(自身を含む): 51184980

約数和(自身を除く): 29519540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 135409, 270818, 541636, 677045, 1083272, 1354090, 2166544, 2708180, 4333088, 5416360, 10832720, 21665440]

約数ペア:

[(1, 21665440), (2, 10832720), (4, 5416360), (5, 4333088), (8, 2708180), (10, 2166544), (16, 1354090), (20, 1083272), (32, 677045), (40, 541636), (80, 270818), (160, 135409)]