21121328

素因数分解:

$2^4\times {\mathrm{139}}^1\times {\mathrm{9497}}^1$

素因数の和:9644

約数の個数: 20

約数和(自身を含む): 41221320

約数和(自身を除く): 20099992

約数列:

[1, 2, 4, 8, 16, 139, 278, 556, 1112, 2224, 9497, 18994, 37988, 75976, 151952, 1320083, 2640166, 5280332, 10560664, 21121328]

約数ペア:

[(1, 21121328), (2, 10560664), (4, 5280332), (8, 2640166), (16, 1320083), (139, 151952), (278, 75976), (556, 37988), (1112, 18994), (2224, 9497)]