21788991

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{167}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 38438400

約数和(自身を除く): 16649409

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 109, 133, 167, 171, 327, 399, 501, 763, 981, 1169, 1197, 1503, 2071, 2289, 3173, 3507, 6213, 6867, 9519, 10521, 14497, 18203, 18639, 22211, 28557, 43491, 54609, 66633, 127421, 130473, 163827, 199899, 345857, 382263, 1037571, 1146789, 2420999, 3112713, 7262997, 21788991]

約数ペア:

[(1, 21788991), (3, 7262997), (7, 3112713), (9, 2420999), (19, 1146789), (21, 1037571), (57, 382263), (63, 345857), (109, 199899), (133, 163827), (167, 130473), (171, 127421), (327, 66633), (399, 54609), (501, 43491), (763, 28557), (981, 22211), (1169, 18639), (1197, 18203), (1503, 14497), (2071, 10521), (2289, 9519), (3173, 6867), (3507, 6213)]