21239253

素因数分解:

$3^4\times 7^1\times {\mathrm{47}}^1\times {\mathrm{797}}^1$

素因数の和:863

約数の個数: 40

約数和(自身を含む): 37078272

約数和(自身を除く): 15839019

約数列:

[1, 3, 7, 9, 21, 27, 47, 63, 81, 141, 189, 329, 423, 567, 797, 987, 1269, 2391, 2961, 3807, 5579, 7173, 8883, 16737, 21519, 26649, 37459, 50211, 64557, 112377, 150633, 262213, 337131, 451899, 786639, 1011393, 2359917, 3034179, 7079751, 21239253]

約数ペア:

[(1, 21239253), (3, 7079751), (7, 3034179), (9, 2359917), (21, 1011393), (27, 786639), (47, 451899), (63, 337131), (81, 262213), (141, 150633), (189, 112377), (329, 64557), (423, 50211), (567, 37459), (797, 26649), (987, 21519), (1269, 16737), (2391, 8883), (2961, 7173), (3807, 5579)]