21640220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{154573}}^1$

素因数の和:154589

約数の個数: 24

約数和(自身を含む): 51936864

約数和(自身を除く): 30296644

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 154573, 309146, 618292, 772865, 1082011, 1545730, 2164022, 3091460, 4328044, 5410055, 10820110, 21640220]

約数ペア:

[(1, 21640220), (2, 10820110), (4, 5410055), (5, 4328044), (7, 3091460), (10, 2164022), (14, 1545730), (20, 1082011), (28, 772865), (35, 618292), (70, 309146), (140, 154573)]