21388888

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{641}}^1$

素因数の和:787

約数の個数: 32

約数和(自身を含む): 41524560

約数和(自身を除く): 20135672

約数列:

[1, 2, 4, 8, 43, 86, 97, 172, 194, 344, 388, 641, 776, 1282, 2564, 4171, 5128, 8342, 16684, 27563, 33368, 55126, 62177, 110252, 124354, 220504, 248708, 497416, 2673611, 5347222, 10694444, 21388888]

約数ペア:

[(1, 21388888), (2, 10694444), (4, 5347222), (8, 2673611), (43, 497416), (86, 248708), (97, 220504), (172, 124354), (194, 110252), (344, 62177), (388, 55126), (641, 33368), (776, 27563), (1282, 16684), (2564, 8342), (4171, 5128)]