21821720

素因数分解:

$2^3\times 5^1\times {\mathrm{545543}}^1$

素因数の和:545554

約数の個数: 16

約数和(自身を含む): 49098960

約数和(自身を除く): 27277240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 545543, 1091086, 2182172, 2727715, 4364344, 5455430, 10910860, 21821720]

約数ペア:

[(1, 21821720), (2, 10910860), (4, 5455430), (5, 4364344), (8, 2727715), (10, 2182172), (20, 1091086), (40, 545543)]