400688

素因数分解:

$2^4\times {\mathrm{79}}^1\times {\mathrm{317}}^1$

素因数の和:404

約数の個数: 20

約数和(自身を含む): 788640

約数和(自身を除く): 387952

約数列:

[1, 2, 4, 8, 16, 79, 158, 316, 317, 632, 634, 1264, 1268, 2536, 5072, 25043, 50086, 100172, 200344, 400688]

約数ペア:

[(1, 400688), (2, 200344), (4, 100172), (8, 50086), (16, 25043), (79, 5072), (158, 2536), (316, 1268), (317, 1264), (632, 634)]