21499760

素因数分解:

$2^4\times 5^1\times {\mathrm{268747}}^1$

素因数の和:268760

約数の個数: 20

約数和(自身を含む): 49987128

約数和(自身を除く): 28487368

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268747, 537494, 1074988, 1343735, 2149976, 2687470, 4299952, 5374940, 10749880, 21499760]

約数ペア:

[(1, 21499760), (2, 10749880), (4, 5374940), (5, 4299952), (8, 2687470), (10, 2149976), (16, 1343735), (20, 1074988), (40, 537494), (80, 268747)]