21197240

素因数分解:

$2^3\times 5^1\times {\mathrm{331}}^1\times {\mathrm{1601}}^1$

素因数の和:1943

約数の個数: 32

約数和(自身を含む): 47867760

約数和(自身を除く): 26670520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 331, 662, 1324, 1601, 1655, 2648, 3202, 3310, 6404, 6620, 8005, 12808, 13240, 16010, 32020, 64040, 529931, 1059862, 2119724, 2649655, 4239448, 5299310, 10598620, 21197240]

約数ペア:

[(1, 21197240), (2, 10598620), (4, 5299310), (5, 4239448), (8, 2649655), (10, 2119724), (20, 1059862), (40, 529931), (331, 64040), (662, 32020), (1324, 16010), (1601, 13240), (1655, 12808), (2648, 8005), (3202, 6620), (3310, 6404)]