21121720

素因数分解:

$2^3\times 5^1\times {\mathrm{528043}}^1$

素因数の和:528054

約数の個数: 16

約数和(自身を含む): 47523960

約数和(自身を除く): 26402240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 528043, 1056086, 2112172, 2640215, 4224344, 5280430, 10560860, 21121720]

約数ペア:

[(1, 21121720), (2, 10560860), (4, 5280430), (5, 4224344), (8, 2640215), (10, 2112172), (20, 1056086), (40, 528043)]