21978278

素因数分解:

$2^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{23431}}^1$

素因数の和:23507

約数の個数: 16

約数和(自身を含む): 38241024

約数和(自身を除く): 16262746

約数列:

[1, 2, 7, 14, 67, 134, 469, 938, 23431, 46862, 164017, 328034, 1569877, 3139754, 10989139, 21978278]

約数ペア:

[(1, 21978278), (2, 10989139), (7, 3139754), (14, 1569877), (67, 328034), (134, 164017), (469, 46862), (938, 23431)]