20721872

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{30119}}^1$

素因数の和:30170

約数の個数: 20

約数和(自身を含む): 41083680

約数和(自身を除く): 20361808

約数列:

[1, 2, 4, 8, 16, 43, 86, 172, 344, 688, 30119, 60238, 120476, 240952, 481904, 1295117, 2590234, 5180468, 10360936, 20721872]

約数ペア:

[(1, 20721872), (2, 10360936), (4, 5180468), (8, 2590234), (16, 1295117), (43, 481904), (86, 240952), (172, 120476), (344, 60238), (688, 30119)]