21639560

素因数分解:

$2^3\times 5^1\times {\mathrm{540989}}^1$

素因数の和:541000

約数の個数: 16

約数和(自身を含む): 48689100

約数和(自身を除く): 27049540

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 540989, 1081978, 2163956, 2704945, 4327912, 5409890, 10819780, 21639560]

約数ペア:

[(1, 21639560), (2, 10819780), (4, 5409890), (5, 4327912), (8, 2704945), (10, 2163956), (20, 1081978), (40, 540989)]