21211778

素因数分解:

$2^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{7691}}^1$

素因数の和:7897

約数の個数: 16

約数和(自身を含む): 36552384

約数和(自身を除く): 15340606

約数列:

[1, 2, 7, 14, 197, 394, 1379, 2758, 7691, 15382, 53837, 107674, 1515127, 3030254, 10605889, 21211778]

約数ペア:

[(1, 21211778), (2, 10605889), (7, 3030254), (14, 1515127), (197, 107674), (394, 53837), (1379, 15382), (2758, 7691)]