19684540

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{487}}^1$

素因数の和:586

約数の個数: 48

約数和(自身を含む): 43287552

約数和(自身を除く): 23603012

約数列:

[1, 2, 4, 5, 10, 20, 43, 47, 86, 94, 172, 188, 215, 235, 430, 470, 487, 860, 940, 974, 1948, 2021, 2435, 4042, 4870, 8084, 9740, 10105, 20210, 20941, 22889, 40420, 41882, 45778, 83764, 91556, 104705, 114445, 209410, 228890, 418820, 457780, 984227, 1968454, 3936908, 4921135, 9842270, 19684540]

約数ペア:

[(1, 19684540), (2, 9842270), (4, 4921135), (5, 3936908), (10, 1968454), (20, 984227), (43, 457780), (47, 418820), (86, 228890), (94, 209410), (172, 114445), (188, 104705), (215, 91556), (235, 83764), (430, 45778), (470, 41882), (487, 40420), (860, 22889), (940, 20941), (974, 20210), (1948, 10105), (2021, 9740), (2435, 8084), (4042, 4870)]