21207999

素因数分解:

$3^1\times {\mathrm{31}}^1\times {\mathrm{457}}^1\times {\mathrm{499}}^1$

素因数の和:990

約数の個数: 16

約数和(自身を含む): 29312000

約数和(自身を除く): 8104001

約数列:

[1, 3, 31, 93, 457, 499, 1371, 1497, 14167, 15469, 42501, 46407, 228043, 684129, 7069333, 21207999]

約数ペア:

[(1, 21207999), (3, 7069333), (31, 684129), (93, 228043), (457, 46407), (499, 42501), (1371, 15469), (1497, 14167)]