21305980

素因数分解:

$2^2\times 5^1\times {\mathrm{619}}^1\times {\mathrm{1721}}^1$

素因数の和:2349

約数の個数: 24

約数和(自身を含む): 44840880

約数和(自身を除く): 23534900

約数列:

[1, 2, 4, 5, 10, 20, 619, 1238, 1721, 2476, 3095, 3442, 6190, 6884, 8605, 12380, 17210, 34420, 1065299, 2130598, 4261196, 5326495, 10652990, 21305980]

約数ペア:

[(1, 21305980), (2, 10652990), (4, 5326495), (5, 4261196), (10, 2130598), (20, 1065299), (619, 34420), (1238, 17210), (1721, 12380), (2476, 8605), (3095, 6884), (3442, 6190)]